stablegradients/pie-gem5-pairs huggingface dataset:
// Slower C++ solution:
#include <bits/stdc++.h>

#define endl '\n'

#define ll long long

using namespace std;



const int MXN = 1e5 + 5;

int n, k;

int a[MXN], b[MXN], c[MXN];

int dp[MXN][4];



int Dp(int d, int lst) {

    if(d == n) return 0;

    if(dp[d][lst] != -1) return dp[d][lst];

    int ans = 0;

    if(lst != 0) ans = Dp(d + 1, 0) + a[d];

    if(lst != 1) ans = max(ans, Dp(d + 1, 1) + b[d]);

    if(lst != 2) ans = max(ans, Dp(d + 1, 2) + c[d]);

    return dp[d][lst] = ans;

}



int main() {

    ios_base::sync_with_stdio(false); cin.tie(NULL);

    cin >> n;

    for(int i = 0; i < n; i++) {

        cin >> a[i] >> b[i] >> c[i];

    }

    memset(dp, -1, sizeof dp);

    cout << Dp(0, 3) << endl;

    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 2.580814393488346x):
#include<bits/stdc++.h>

#define ll long long int

#define vll vector<pair<ll, ll> >

#define vl vector<ll>

#define vi vector<int>

#define vii vector<pair<int, int> >

const ll mod = 1e9 + 7;

using namespace std;



ll power_mod(ll x, ll y, ll p)

{

	ll ans = 1;

	x = x%p;

	if(x==0)

	return p;



	while(y>0)

	{

		if(y&1)

		{

			ans = (ans*x)%p;

		}

		y = y>>1;

		x = (x*x)%p;

	}

	return ans;

} 



int main()

{

	ios_base::sync_with_stdio(false);

	cin.tie(0);

	

		

		ll i,j,k,l,m,n;

		cin>>n;

		int check[n][3];

		int a[n], b[n], c[n];

		for(i=0;i<n;i++)

		{

		    cin>>a[i]>>b[i]>>c[i];

		    check[i][0] = a[i];

		    check[i][1] = b[i];

		    check[i][2] = c[i];

		    

		}

		

		//int max = 0;

		for(i=n-2;i>=0;i--)

		{

		    check[i][0] = check[i][0] + max(check[i+1][1], check[i+1][2]);

		    check[i][1] = check[i][1] + max(check[i+1][0], check[i+1][2]);

		    check[i][2] = check[i][2] + max(check[i+1][0], check[i+1][1]);

		}

		

		

		cout<<max(check[0][0], max(check[0][1], check[0][2]));

	

	return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>



using namespace std;

#define tam 100001

int A[tam][3],n;

int dp[tam][3];

int solver(int y, int x)

{

    if(dp[y][x]!=-1)

        return dp[y][x];

    if(y == 0 )

    {

    	dp[y][x] = A[y][x];

        return A[y][x];

    }

    return dp[y][x] = max(solver((y-1),(x+1)%3)+ A[y][x],

	solver((y-1),(x+2)%3) + A[y][x]);

}

int main()

{

    int bas;

    cin>>n;

    for(int i = 0;i < n ;i++)

        for(int j = 0 ; j < 3; j++)

            cin >>A[i][j];

    memset(dp,-1,sizeof dp);

     for(int i = 0; i < 3; i ++)

    	bas = solver(n-1,i);

    cout <<max(max(dp[n-1][0],dp[n-1][1]),max(dp[n-1][0],dp[n-1][2]))<<"\n";

    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 2.176545939474774x):
#include<bits/stdc++.h>

#define ll long long int

#define vll vector<pair<ll, ll> >

#define vl vector<ll>

#define vi vector<int>

#define vii vector<pair<int, int> >

const ll mod = 1e9 + 7;

using namespace std;



ll power_mod(ll x, ll y, ll p)

{

	ll ans = 1;

	x = x%p;

	if(x==0)

	return p;



	while(y>0)

	{

		if(y&1)

		{

			ans = (ans*x)%p;

		}

		y = y>>1;

		x = (x*x)%p;

	}

	return ans;

} 



int main()

{

	ios_base::sync_with_stdio(false);

	cin.tie(0);

	

		

		ll i,j,k,l,m,n;

		cin>>n;

		int check[n][3];

		int a[n], b[n], c[n];

		for(i=0;i<n;i++)

		{

		    cin>>a[i]>>b[i]>>c[i];

		    check[i][0] = a[i];

		    check[i][1] = b[i];

		    check[i][2] = c[i];

		    

		}

		

		//int max = 0;

		for(i=n-2;i>=0;i--)

		{

		    check[i][0] = check[i][0] + max(check[i+1][1], check[i+1][2]);

		    check[i][1] = check[i][1] + max(check[i+1][0], check[i+1][2]);

		    check[i][2] = check[i][2] + max(check[i+1][0], check[i+1][1]);

		}

		

		

		cout<<max(check[0][0], max(check[0][1], check[0][2]));

	

	return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

 

#define pb push_back

#define fst first

#define snd second

#define INF 0x7fffffff

#define INFLL 0x7FFFFFFFFFFFFFFF

#define lenA(ar) sizeof(ar)/sizeof(*ar)

#define lenrows(mat) sizeof(mat)/sizeof(*mat)

#define lencols(mat) sizeof(*mat)/sizeof(**mat)

#define fill(a,c) memset(&a, c, sizeof(a))

#define fore(i,x,y) for(ll i=x;i<y;i++)

#define foreI(i,x,y) for(ll i=x-1;i>=y;i--)

#define max2(a,b) max(a, b)

#define max3(a,b,c) max2(max2(a,b),c)

#define min2(a,b) min(a, b)

#define min3(a,b,c) min2(min2(a,b),c)

#define MOD 1000000009

#define all(x) (x).begin(), (x).end()

#define rall(x) (x).rbegin(), (x).rend()

#define FIN ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)

 

typedef long long ll;

typedef unsigned long long ull;

 

using namespace std;

ll arr[100010][3];

ll dp[100010][3];

int n;

ll solve(int i, int j){

    if(i==n-1) return arr[i][j];

    ll &r = dp[i][j];

    if(r>-1) return r;

    ll a = 0; ll b = 0;ll c = 0; ll act=arr[i][j];

    if(j!=0) a=solve(i+1, 0)+act;

    if(j!=1) b=solve(i+1, 1)+act;

    if(j!=2) c=solve(i+1, 2)+act;

   return r=max3(a,b,c);

}

 

int main() {

     

    cin>>n;

    arr[n][3];

    memset(dp,-1,sizeof(dp));

    fore(i,0,n){

        fore(j,0,3){

            cin>>arr[i][j];

        }

    }

 

    cout<<max3(solve(0,0),solve(0,1),solve(0,2))<<"\n";

 

    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 3.3596062079818907x):
#include<bits/stdc++.h>

#define ll long long int

#define vll vector<pair<ll, ll> >

#define vl vector<ll>

#define vi vector<int>

#define vii vector<pair<int, int> >

const ll mod = 1e9 + 7;

using namespace std;



ll power_mod(ll x, ll y, ll p)

{

	ll ans = 1;

	x = x%p;

	if(x==0)

	return p;



	while(y>0)

	{

		if(y&1)

		{

			ans = (ans*x)%p;

		}

		y = y>>1;

		x = (x*x)%p;

	}

	return ans;

} 



int main()

{

	ios_base::sync_with_stdio(false);

	cin.tie(0);

	

		

		ll i,j,k,l,m,n;

		cin>>n;

		int check[n][3];

		int a[n], b[n], c[n];

		for(i=0;i<n;i++)

		{

		    cin>>a[i]>>b[i]>>c[i];

		    check[i][0] = a[i];

		    check[i][1] = b[i];

		    check[i][2] = c[i];

		    

		}

		

		//int max = 0;

		for(i=n-2;i>=0;i--)

		{

		    check[i][0] = check[i][0] + max(check[i+1][1], check[i+1][2]);

		    check[i][1] = check[i][1] + max(check[i+1][0], check[i+1][2]);

		    check[i][2] = check[i][2] + max(check[i+1][0], check[i+1][1]);

		}

		

		

		cout<<max(check[0][0], max(check[0][1], check[0][2]));

	

	return 0;

}
// Slower C++ solution:
#include <cstring>

#include <iostream>

using namespace std;

const int MAXN=1e5+7;

int n,ans;

int h[MAXN][5],f[MAXN][5][5];

int main()

{

	cin>>n;

	for(int i=1;i<=n;i++) 

		cin>>h[i][1]>>h[i][2]>>h[i][3];

	memset(f,127,sizeof(f));

	for(int i=1;i<=3;i++)

		for(int j=1;j<=3;j++) f[1][i][j]=h[1][i];

	for(int i=2;i<=n;i++)

		for(int j=1;j<=3;j++)

			for(int k=1;k<=3;k++)

			{

				int maxx=0;

				for(int l=1;l<=3;l++)

					if(j!=k&&k!=l) maxx=max(maxx,f[i-1][k][l]);

				f[i][j][k]=maxx+h[i][j];

			}

	for(int i=1;i<=3;i++)

		for(int j=1;j<=3;j++) ans=max(ans,f[n][i][j]);

	cout<<ans<<endl;

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 11.36785294814438x):
#include<bits/stdc++.h>

#define ll long long int

#define vll vector<pair<ll, ll> >

#define vl vector<ll>

#define vi vector<int>

#define vii vector<pair<int, int> >

const ll mod = 1e9 + 7;

using namespace std;



ll power_mod(ll x, ll y, ll p)

{

	ll ans = 1;

	x = x%p;

	if(x==0)

	return p;



	while(y>0)

	{

		if(y&1)

		{

			ans = (ans*x)%p;

		}

		y = y>>1;

		x = (x*x)%p;

	}

	return ans;

} 



int main()

{

	ios_base::sync_with_stdio(false);

	cin.tie(0);

	

		

		ll i,j,k,l,m,n;

		cin>>n;

		int check[n][3];

		int a[n], b[n], c[n];

		for(i=0;i<n;i++)

		{

		    cin>>a[i]>>b[i]>>c[i];

		    check[i][0] = a[i];

		    check[i][1] = b[i];

		    check[i][2] = c[i];

		    

		}

		

		//int max = 0;

		for(i=n-2;i>=0;i--)

		{

		    check[i][0] = check[i][0] + max(check[i+1][1], check[i+1][2]);

		    check[i][1] = check[i][1] + max(check[i+1][0], check[i+1][2]);

		    check[i][2] = check[i][2] + max(check[i+1][0], check[i+1][1]);

		}

		

		

		cout<<max(check[0][0], max(check[0][1], check[0][2]));

	

	return 0;

}
// Slower C++ solution:
#include <cstdio>

#include <algorithm>

#include <cstring>

const int maxn = 3e5 + 5;

using namespace std;



int N;

int a[maxn][4];

int dp[maxn][4];

int main()

{

	scanf("%d", &N);

	for(int i = 1;i <= N;i++)

	{

		for(int j = 1;j <= 3;j++)		

		{

			scanf("%d", &a[i][j]);

		}

	}

	memset(dp, 0, sizeof dp);

	for(int i = 1;i <= 3;i++)

		dp[1][i] = a[1][i];

	for(int i = 2;i <= N;i++)

	{

		dp[i][1] = max(dp[i - 1][2] + a[i][1], dp[i - 1][3] + a[i][1]);

		dp[i][2] = max(dp[i - 1][1] + a[i][2], dp[i - 1][3] + a[i][2]);

		dp[i][3] = max(dp[i - 1][1] + a[i][3], dp[i - 1][2] + a[i][3]);

	}

	int ans = 0;

	for(int i = 1;i <= 3;i++)

		ans = max(dp[N][i], ans);

	printf("%d\n", ans);

	return 0;	

}

// Faster C++ solution for the same problem (measured speedup: 5.05213473673325x):
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxN = 1e5 + 10;



int a[maxN][3];

int dp[maxN][3];

int main(){

//  freopen("abc.inp", "r", stdin); freopen("abc.out", "w", stdout);

  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n; cin >> n;

  int inf = 1 << 30;

  for (int i = 1; i <= n; ++i) {

    for (int j = 0; j < 3; ++j) {

      cin >> a[i][j];

    }

  }

  for (int j = 0; j < 3; ++j)

    dp[1][j] = a[1][j];

  for (int i = 1; i < n; ++i) {

    for (int j = 0; j < 3; ++j) {

      for (int t = 0; t < 3; ++t) {

        if (t != j)

          dp[i+1][t] = max(dp[i+1][t], dp[i][j] + a[i+1][t]);

      }

    }

  }

  cout << max({dp[n][0], dp[n][1], dp[n][2]});

return 0;

}
// Slower C++ solution:
#include<bits/stdc++.h>

using namespace std;

#define db(x) cerr<<__LINE__<<": "<<#x<<" = "<<(x)<<'\n'

const int N = 1e5;

int A[N+7][5], mem[N+7][5];



int dp(int i, int j) {

	if(i==0) return 0;

	if(mem[i][j]!=-1) return mem[i][j];

	if(j==1) return mem[i][j] = A[i][j] + max(dp(i-1, 2), dp(i-1, 3));

	if(j==2) return mem[i][j] = A[i][j] + max(dp(i-1, 3), dp(i-1, 1));

	else return mem[i][j] = A[i][j] + max(dp(i-1, 1), dp(i-1, 2));

}

int main(){

	ios_base::sync_with_stdio(0);

	int a,b,n,T,cas=0;

	cin>>n;

	for(int i=1;i<=n;++i) {

		cin>>A[i][1]>>A[i][2]>>A[i][3];

	}

	memset(mem, -1, sizeof(mem));

	int res = max(dp(n,1), max(dp(n,2), dp(n,3)));

	cout<<res<<endl;

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 2.9808469303296783x):
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxN = 1e5 + 10;



int a[maxN][3];

int dp[maxN][3];

int main(){

//  freopen("abc.inp", "r", stdin); freopen("abc.out", "w", stdout);

  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n; cin >> n;

  int inf = 1 << 30;

  for (int i = 1; i <= n; ++i) {

    for (int j = 0; j < 3; ++j) {

      cin >> a[i][j];

    }

  }

  for (int j = 0; j < 3; ++j)

    dp[1][j] = a[1][j];

  for (int i = 1; i < n; ++i) {

    for (int j = 0; j < 3; ++j) {

      for (int t = 0; t < 3; ++t) {

        if (t != j)

          dp[i+1][t] = max(dp[i+1][t], dp[i][j] + a[i+1][t]);

      }

    }

  }

  cout << max({dp[n][0], dp[n][1], dp[n][2]});

return 0;

}
// Slower C++ solution:
/*|In The Name Of Allah|*/



#include <bits/stdc++.h>



using namespace std;



const int N = 1e5+5;



int n;

int a[N][3];

int mem[N][3];



int go(int idx , int lst){

    if(idx == n + 1)

        return 0;

    if(~mem[idx][lst])

        return mem[idx][lst];

    int best = 0;

    for(int i = 0; i < 3; i++){

        if(idx == 1 || lst != i){

            best = max(best , go(idx + 1 , i) + a[idx][i]);

        }

    }

    return mem[idx][lst] = best;

}



int main(){

    scanf("%d" , &n);

    for(int i = 1; i <= n; i++){

        for(int j = 0; j < 3; j++){

            scanf("%d" , &a[i][j]);

        }

    }

    memset(mem , -1 , sizeof mem);

    printf("%d\n" , go(1 , 0));

}


// Faster C++ solution for the same problem (measured speedup: 2.1635544333584953x):
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxN = 1e5 + 10;



int a[maxN][3];

int dp[maxN][3];

int main(){

//  freopen("abc.inp", "r", stdin); freopen("abc.out", "w", stdout);

  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n; cin >> n;

  int inf = 1 << 30;

  for (int i = 1; i <= n; ++i) {

    for (int j = 0; j < 3; ++j) {

      cin >> a[i][j];

    }

  }

  for (int j = 0; j < 3; ++j)

    dp[1][j] = a[1][j];

  for (int i = 1; i < n; ++i) {

    for (int j = 0; j < 3; ++j) {

      for (int t = 0; t < 3; ++t) {

        if (t != j)

          dp[i+1][t] = max(dp[i+1][t], dp[i][j] + a[i+1][t]);

      }

    }

  }

  cout << max({dp[n][0], dp[n][1], dp[n][2]});

return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

typedef long long int lli;

typedef long double ld;

const int oo = 1e9;

//const int mod = 1e9+9;

/*ll gcd(ll x, ll y){return (y ? gcd(y, x%y) : x); }

*ll lcm(ll x, ll y){return x*(y/gcd(x,y));}

*void exEuclid(int a, int b){

	if(b==0){x = 1; y=0; d=a; return ;}

	exEuclid(b, a%b);

	int x1 = y;

	int y1 = x-(a/b)*y;

	x = x1; 100000

	y = y1;

} 

* */

//===========================================================//

int n;

const int nx = 1e5+5;

int ac[nx][3];

int dp[3][nx];

int go(int a, int i){

	if(i == n) return 0;

	if(dp[a][i] != -1) return dp[a][i];

	int& ans = dp[a][i];

	

	if(a==0){

		ans=max(ans, go(1, i+1)+ac[i][0]);

		ans=max(ans, go(2, i+1)+ac[i][0]);

	}

	if(a==1){

		ans=max(ans, go(0, i+1)+ac[i][1]);

		ans=max(ans, go(2, i+1)+ac[i][1]);

	}

	if(a==2){

		ans=max(ans, go(0, i+1)+ac[i][2]);

		ans=max(ans, go(1, i+1)+ac[i][2]);

	}

	

	return ans;

}

int main(){

	cin>>n;

	for(int i=0; i<n; i++) cin>>ac[i][0]>>ac[i][1]>>ac[i][2];

	memset(dp, -1, sizeof dp);

	cout<<max(go(0,0),max(go(1,0),go(2,0)))<<"\n";

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 2.1819538726095007x):
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxN = 1e5 + 10;



int a[maxN][3];

int dp[maxN][3];

int main(){

//  freopen("abc.inp", "r", stdin); freopen("abc.out", "w", stdout);

  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n; cin >> n;

  int inf = 1 << 30;

  for (int i = 1; i <= n; ++i) {

    for (int j = 0; j < 3; ++j) {

      cin >> a[i][j];

    }

  }

  for (int j = 0; j < 3; ++j)

    dp[1][j] = a[1][j];

  for (int i = 1; i < n; ++i) {

    for (int j = 0; j < 3; ++j) {

      for (int t = 0; t < 3; ++t) {

        if (t != j)

          dp[i+1][t] = max(dp[i+1][t], dp[i][j] + a[i+1][t]);

      }

    }

  }

  cout << max({dp[n][0], dp[n][1], dp[n][2]});

return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;



int m;

const int mx = 1e5+5;

int tasks[mx][3];

int diario[3][mx];

int cosa(int a, int i){

	if(i == m){

     return 0;

     }



	if(diario[a][i] != -1) {

        return diario[a][i];

    }

	int& ans = diario[a][i];



        if(a==0){

		ans=max(ans, cosa(1, i+1)+tasks[i][0]);

		ans=max(ans, cosa(2, i+1)+tasks[i][0]);

	}

        if(a==1){

		ans=max(ans, cosa(0, i+1)+tasks[i][1]);

		ans=max(ans, cosa(2, i+1)+tasks[i][1]);

        }

	if(a==2){

		ans=max(ans, cosa(0, i+1)+tasks[i][2]);

		ans=max(ans, cosa(1, i+1)+tasks[i][2]);

	}



	return ans;

}

int main(){

	cin>>m;

	for(int i=0; i<m; i++) {

        cin>>tasks[i][0]>>tasks[i][1]>>tasks[i][2];

	}

	memset(diario, -1, sizeof diario);

	cout<<max(cosa(0,0),max(cosa(1,0),cosa(2,0)))<<"\n";

	return 0;

}


// Faster C++ solution for the same problem (measured speedup: 2.1819798758620714x):
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxN = 1e5 + 10;



int a[maxN][3];

int dp[maxN][3];

int main(){

//  freopen("abc.inp", "r", stdin); freopen("abc.out", "w", stdout);

  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n; cin >> n;

  int inf = 1 << 30;

  for (int i = 1; i <= n; ++i) {

    for (int j = 0; j < 3; ++j) {

      cin >> a[i][j];

    }

  }

  for (int j = 0; j < 3; ++j)

    dp[1][j] = a[1][j];

  for (int i = 1; i < n; ++i) {

    for (int j = 0; j < 3; ++j) {

      for (int t = 0; t < 3; ++t) {

        if (t != j)

          dp[i+1][t] = max(dp[i+1][t], dp[i][j] + a[i+1][t]);

      }

    }

  }

  cout << max({dp[n][0], dp[n][1], dp[n][2]});

return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

typedef long long int lli;

typedef long double ld;

const int oo = 1e9;



int nn;

const int nxx = 1e5+5;

int acc[nxx][3];

int dpp[3][nxx];

int go(int aa, int ii)

{

	if(ii==nn) return 0;

	if(dpp[aa][ii] != -1) return dpp[aa][ii];

	int& ans = dpp[aa][ii];

	if(aa==0)

	{

		ans=max(ans, go(1, ii+1)+acc[ii][0]);

		ans=max(ans, go(2, ii+1)+acc[ii][0]);

	}

	if(aa==1)

	{

		ans=max(ans, go(0, ii+1)+acc[ii][1]);

		ans=max(ans, go(2, ii+1)+acc[ii][1]);

	}

	if(aa==2)

	{

		ans=max(ans, go(0, ii+1)+acc[ii][2]);

		ans=max(ans, go(1, ii+1)+acc[ii][2]);

	}



	return ans;



}

int main()

{

    cin>>nn;

    for(int ii=0; ii<nn; ii++) cin>>acc[ii][0]>>acc[ii][1]>>acc[ii][2];

    memset(dpp, -1, sizeof dpp);

    cout<<max(go(0,0), max(go(1,0),go(2,0)))<<"\n";

    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 2.181977684592073x):
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxN = 1e5 + 10;



int a[maxN][3];

int dp[maxN][3];

int main(){

//  freopen("abc.inp", "r", stdin); freopen("abc.out", "w", stdout);

  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n; cin >> n;

  int inf = 1 << 30;

  for (int i = 1; i <= n; ++i) {

    for (int j = 0; j < 3; ++j) {

      cin >> a[i][j];

    }

  }

  for (int j = 0; j < 3; ++j)

    dp[1][j] = a[1][j];

  for (int i = 1; i < n; ++i) {

    for (int j = 0; j < 3; ++j) {

      for (int t = 0; t < 3; ++t) {

        if (t != j)

          dp[i+1][t] = max(dp[i+1][t], dp[i][j] + a[i+1][t]);

      }

    }

  }

  cout << max({dp[n][0], dp[n][1], dp[n][2]});

return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

typedef long long int lli;

typedef long double ld;

const int oo = 1e9;



int n;

const int nx = 1e5+5;

int ac[nx][3];

int dp[3][nx];

int go(int a, int i)

{

	if(i==n) return 0;

	if(dp[a][i] != -1) return dp[a][i];

	int& ans = dp[a][i];

	if(a==0)

	{

		ans=max(ans, go(1, i+1)+ac[i][0]);

		ans=max(ans, go(2, i+1)+ac[i][0]);

	}

	if(a==1)

	{

		ans=max(ans, go(0, i+1)+ac[i][1]);

		ans=max(ans, go(2, i+1)+ac[i][1]);

	}

	if(a==2)

	{

		ans=max(ans, go(0, i+1)+ac[i][2]);

		ans=max(ans, go(1, i+1)+ac[i][2]);

	}

	

	return ans;

	

}

int main()

{

    cin>>n;

    for(int i=0; i<n; i++) cin>>ac[i][0]>>ac[i][1]>>ac[i][2];

    memset(dp, -1, sizeof dp);

    cout<<max(go(0,0), max(go(1,0),go(2,0)))<<"\n";

    return 0;

}

	

// Faster C++ solution for the same problem (measured speedup: 2.1819538726095007x):
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxN = 1e5 + 10;



int a[maxN][3];

int dp[maxN][3];

int main(){

//  freopen("abc.inp", "r", stdin); freopen("abc.out", "w", stdout);

  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n; cin >> n;

  int inf = 1 << 30;

  for (int i = 1; i <= n; ++i) {

    for (int j = 0; j < 3; ++j) {

      cin >> a[i][j];

    }

  }

  for (int j = 0; j < 3; ++j)

    dp[1][j] = a[1][j];

  for (int i = 1; i < n; ++i) {

    for (int j = 0; j < 3; ++j) {

      for (int t = 0; t < 3; ++t) {

        if (t != j)

          dp[i+1][t] = max(dp[i+1][t], dp[i][j] + a[i+1][t]);

      }

    }

  }

  cout << max({dp[n][0], dp[n][1], dp[n][2]});

return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;

int v[100009][3];

int dp[100009][3];

int n;

int vacation(int i, int j)

{

    if(i==n-1)

        return dp[i][j]=v[i][j];

    if(i>=n || j>=3)

        return 0;

    if(dp[i][j]!=-1)

        return dp[i][j];

    int temp = INT_MIN;

        if(j==0)

        {

             temp = max(vacation(i+1,j+1)+v[i][j],temp);

        temp = max(vacation(i+1,j+2)+v[i][j],temp);

 return dp[i][j]= temp;

        }

      else  if(j==1)

        {

             temp = max(vacation(i+1,0)+v[i][j],temp);

        temp = max(vacation(i+1,2)+v[i][j],temp);

 return dp[i][j]= temp;

        }

        else

        {

             temp = max(vacation(i+1,1)+v[i][j],temp);

        temp = max(vacation(i+1,0)+v[i][j],temp);

         return dp[i][j]= temp;

        }

}



int main()

{

    cin>>n;

    memset(dp,-1,sizeof(dp));

    for(int i=0; i<n; i++)

        cin>>v[i][0]>>v[i][1]>>v[i][2];

    cout<<max(vacation(0,0),max(vacation(0,1),vacation(0,2)))<<endl;

}


// Faster C++ solution for the same problem (measured speedup: 2.1820744115613895x):
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxN = 1e5 + 10;



int a[maxN][3];

int dp[maxN][3];

int main(){

//  freopen("abc.inp", "r", stdin); freopen("abc.out", "w", stdout);

  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n; cin >> n;

  int inf = 1 << 30;

  for (int i = 1; i <= n; ++i) {

    for (int j = 0; j < 3; ++j) {

      cin >> a[i][j];

    }

  }

  for (int j = 0; j < 3; ++j)

    dp[1][j] = a[1][j];

  for (int i = 1; i < n; ++i) {

    for (int j = 0; j < 3; ++j) {

      for (int t = 0; t < 3; ++t) {

        if (t != j)

          dp[i+1][t] = max(dp[i+1][t], dp[i][j] + a[i+1][t]);

      }

    }

  }

  cout << max({dp[n][0], dp[n][1], dp[n][2]});

return 0;

}
// Slower C++ solution:
#include <bits/stdc++.h>



using namespace std;

typedef long long ll;

typedef double dd;

#define all(v) v.begin(),v.end()

#define endl "\n"

#define clr(n, r) memset(n,r,sizeof(n));



void fast() {

    cin.tie(0);

    cin.sync_with_stdio(0);

}

const int MAX=1e5+10;

int n,a[MAX],b[MAX],c[MAX],dp[MAX][3];

int ans(int i,int prev){

    if(i==n)return 0;

    int path1=0,path2=0,path3=0;

    int &ret=dp[i][prev];

    if(prev!=-1&&ret!=-1)return ret;

    if(prev!=0){

        path1=a[i]+ans(i+1,0);

    }

    if(prev!=1){

        path2=b[i]+ans(i+1,1);

    }

    if(prev!=2){

        path3=c[i]+ans(i+1,2);

    }

    return ret=max(path1,max(path2,path3));

}



int main() {

    fast();

    cin>>n;

    for (int i = 0; i < n; ++i) {

    cin>>a[i]>>b[i]>>c[i];

    }

    clr(dp,-1);

    cout<<ans(0,-1);

}


// Faster C++ solution for the same problem (measured speedup: 2.1922659592042777x):
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int maxN = 1e5 + 10;



int a[maxN][3];

int dp[maxN][3];

int main(){

//  freopen("abc.inp", "r", stdin); freopen("abc.out", "w", stdout);

  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n; cin >> n;

  int inf = 1 << 30;

  for (int i = 1; i <= n; ++i) {

    for (int j = 0; j < 3; ++j) {

      cin >> a[i][j];

    }

  }

  for (int j = 0; j < 3; ++j)

    dp[1][j] = a[1][j];

  for (int i = 1; i < n; ++i) {

    for (int j = 0; j < 3; ++j) {

      for (int t = 0; t < 3; ++t) {

        if (t != j)

          dp[i+1][t] = max(dp[i+1][t], dp[i][j] + a[i+1][t]);

      }

    }

  }

  cout << max({dp[n][0], dp[n][1], dp[n][2]});

return 0;

}