Go: package main

import (
	"fmt"
)

func main() {
	var A, B, N int
	fmt.Scanf("%d %d %d", &A, &B, &N)

	login := 0
	week := 0
	sum := 0

	for sum < N {
		login++
		week++
		sum += A

		if week%7 == 0 {
			sum += B
			week = 0
		}
	}

	fmt.Println(login)
}

C++: #include<bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define int long long
#define vec(a,n) vector<int> (a)((n));
#define Vec(a,n) vector<string> (a)((n));
#define twovec(a,n,m) vector<vector<int>> a(n,vector<int>(m,0));
#define Twovec(a,n,m) vector<vector<double>> a(n,vector<double>(m,0));
#define P pair<int,int>
#define All(a) (a).begin(),(a).end()
#define Sort(a) sort(All(a));
#define Reverse(a) reverse(All(a));
#define PQ(n) priority_queue<P,vector<P>,greater<P>> (n)
#define pq(n) priority_queue<int> (n)
#define print(a) cout << (a) << endl;
#define printD(a) cout << setprecision(10) << ans << endl;
using namespace std;
int max_int = 1000000007;
void Debug(auto a);
int nibul(auto a,auto b);
int nibuu(auto a,auto b);
void input(vector<int>& a,int n);

int n;
struct UnionFind {
    vector<int> par; // par[i]:iの親の番号　(例) par[3] = 2 : 3の親が2

    UnionFind(int N) : par(N) { //最初は全てが根であるとして初期化
        for(int i = 0; i < N; i++) par[i] = i;
    }

    int root(int x) { // データxが属する木の根を再帰で得る：root(x) = {xの木の根}
        if (par[x] == x) return x;
        return par[x] = root(par[x]);
    }

    void unite(int x, int y) { // xとyの木を併合
        int rx = root(x); //xの根をrx
        int ry = root(y); //yの根をry
        if (rx == ry) return; //xとyの根が同じ(=同じ木にある)時はそのまま
        par[rx] = ry; //xとyの根が同じでない(=同じ木にない)時：xの根rxをyの根ryにつける
    }

    bool same(int x, int y) { // 2つのデータx, yが属する木が同じならtrueを返す
        int rx = root(x);
        int ry = root(y);
        return rx == ry;
    }
};


signed main(){
    int a,b,c;
    cin >> a >> b >> c;
    int mon = a*7+b;
    int ans = (c/mon)*7;
    c %= mon;
    if(c>a*7){
        ans += 7;
    }
    else{
        while(c>0){
            ans++;
            c -= a;
        }
    }
    print(ans)
    return 0;
}

void Debug(auto a){
    cout << "{ ";
    for(auto b: a){
        cout << b << " ";
    }
    cout << "}" << endl;
}
int nibul(auto a,auto b){
    int x = lower_bound(All(a),b) - a.begin();
    //key以上の初めてのitr
    return x;
}
int nibuu(auto a,auto b){
    int x = upper_bound(All(a),b) - a.begin();
    //key以下の最後のitr
    return x-1;
}

void input(vector<int>& a,int n){
    REP(i,n){
        cin >> a[i];
    }
}

C++: #include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<cmath>
#include<cstdlib>
#include<tuple>
#include<iomanip>
#include<map>
#include<queue>
#include<set>
#define int long long
using namespace std;
const int INF = 1e10;
const int ZERO = 0;

signed main() {
	int A,B,C;
	cin >> A >> B >> C;
	int N = C / (A * 7 + B);
	int M = C % (A * 7 + B);
	if(M > A * 7) {
		cout << N * 7 + 7 << endl;
	}
	else {
		cout << N * 7 + (M + A - 1) / A << endl;
	}
}

C++: #include<iostream>
#include<vector>
#include<algorithm>
#include<cctype>
#include<utility>
#include<string>
#include<cmath>
#include<cstring>
#include<queue>
#include<map>

#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define FORR(i, m, n) for(int i = m;i >= n;i--)
#define SORT(v, n) sort(v, v+n);
#define VSORT(v) sort(v.begin(), v.end());
#define llong long long
#define pb(a) push_back(a)
using namespace std;
typedef pair<int, int> P;
typedef pair<llong, llong> LP;
typedef pair<int, P> PP;
typedef pair<llong, LP> LPP;
typedef long long int ll;

template<typename T>
vector<T> make_v(size_t a) { return vector<T>(a); }
template<typename T, typename... Ts>
auto make_v(size_t a, Ts... ts) {
	return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}
template<typename T, typename V>
typename enable_if<is_class<T>::value == 0>::type
fill_v(T& t, const V& v) { t = v; }
template<typename T, typename V>
typename enable_if<is_class<T>::value != 0>::type
fill_v(T& t, const V& v) {
	for (auto& e : t) fill_v(e, v);
}


#define ARRAY_MAX 105
const int INF = 1e9 + 7;



int main() {

	int a, b, c;
	cin >> a >> b >> c;

	int ans = 7 * (c / (7 * a + b));
	//cout << a << " " << b << " " << c << endl;
	c -= (7 * a + b) * (c / (7 * a + b));
	
	cout << c << endl;
	ans += (c - 1) / a + 1;

	cout << ans << endl;
}

C++: #include <iostream>
using namespace std;
int main(void){
    int a,b,c,sum=0,n;
    cin >> a >> b >>c;
    //if(c/a > 7){
        for(int i=0; i<100000000; i++){
            sum=i*a+i/7*b;
            if(c<=sum){
                cout << i << endl;
                break;
            }
        }
    //}
    //else{
        //n=c/a;
        //cout << n << endl;
    //}
}

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

using namespace std;

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    int d = 7 * a + b;
    cout << c / d * 7 + min(7, (c % d + a - 1) / a) << '\n';
    return 0;
}

C++: 
#include <iostream>
#include <list>

int main()
{
	int A, B, C;
	std::cin >> A >> B >> C;

	int weekCoin = 7 * A + B;

	int weekNum = C / weekCoin;

	C -= weekNum * weekCoin;

	int dayNum =0;
	if (C / A >= 7) dayNum = 7;
	else dayNum = C / A + ((C%A) ? 1 : 0);
	
	
	std::cout << weekNum * 7 + dayNum << std::endl;

    return 0;
}

C++: #include <iostream>
using namespace std;
int main(void){
    int A,B,C;
    cin >> A >> B >> C;
    
    int o=0;
    o+=(C/(7*A+B))*7+min(7,(C%(7*A+B))/A);
   if((C%(7*A+B))%A>0 and (C%(7*A+B))<7*A)o++;
    cout << o <<endl;
}

C++: #include<iostream>
#include<vector>
#include<string>
#include<cmath>
#include<limits>
#include<algorithm>
#include<numeric>
#include<utility>

using ull = unsigned long long int;
using ll = long long int; 

int main(){
    ll A,B,C;
    std::cin >> A >> B >> C;
    int login = 7;
    int cnt=0;

    while(C>0){
        C-=A;
        login--;
        if(login==0){
            C-=B;
            login=7;
        }
        cnt++;
    }

    std::cout << cnt << std::endl;

    return 0;
}

C++: #include<iostream>

using namespace std;

int main(){
//int W,H,x,y,r;
    int a,b,c;
    int i=0;
    cin>>a>>b>>c;
int ans=0;
while(ans<c){
i++;
ans+=a;
if(i%7==0)
ans+=b;
}
   cout<<i<<endl;   
  
  
  return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
  int i;
  int a,b,c,ans;
  cin>>a>>b>>c;
  for(i=0;;++i){
    c-=a;
    if((i+1)%7==0)c-=b;
    if(c<=0){
      cout<<i+1<<endl;
      break;
    }
  }
}

C++: #include <iostream>
using namespace std;
int main(void){
    int a,b,c,d,day;
    d=0;
    day=0;
    cin>>a>>b>>c;
    while(1){
       if(d>=c){
           break;
       } 
       d=a+d;
       day=day+1;
       if(day%7==0){
           d=d+b;
       }
    }
    cout<<day<<endl;
    
}

C++: #include <iostream>
using namespace std;
int main(void){
    int A,B,C,x,y,w;
    cin>>A>>B>>C;
    if(C<A*7){if(C%A==0){cout<<C/A<<endl;}else{
     cout<<C/A+1<<endl;}   
    }
    if(C>A*7){
        x=C/(7*A+B);
        y=C-x*(7*A+B);
        if(y%A==0){w=y/A;}else{w=y/A+1;}
        
        cout<<x*7+w<<endl;
    }
}

C++: #include <iostream>
using namespace std;
int main(void){
    int A,B,C;
    int cnt=0,sum=0;
    
    cin>>A;
    cin>>B;
    cin>>C;
    
    while(sum<C){
        cnt++;
        sum+=A;
        if(cnt!=0 && cnt%7==0){
            sum+=B;
        }
    }
    
    cout<<cnt<<"\n";
}