#include<bits/stdc++.h>
//One implementation to rule them all?
#define db              double
#define ll              long long int
#define ld              long double
//#define int           long long int
#define ull             unsigned long long
#define fi              first
#define se              second
#define rep(i,a,n)      for(int i=a;i<n;i++)
#define repr(i,n,b)     for(int i=n;i>=b;i--)
#define endl            '\n'
#define mem(a,b)        memset(a, b, sizeof a)
#define mkp             make_pair
#define pb              push_back
#define max3(a,b,c)     max(a,max(b,c))
#define min3(a,b,c)     min(a,min(b,c))
#define w(t)            int t; cin>>t; while(t--)
#define all(a)          a.begin(), a.end()
#define sz(a)           int((a).size())
#define dbg(x)          cerr << #x << " = " << x << endl;
#define dbgp(x)         cerr<<"[ "<<#x<<".ff : "<<x.first<<", "<<#x<<".ss : "<<x.second<<" ]"<<endl
#define dbgs(x)         cerr<<"[ "; for(auto i:x) cerr<<i<<" "; cerr<<" ]"<<endl;
#define dbgm(x)         cerr<<"----------"<<endl; for(auto i:x) cerr<<i.fi<<":"<<i.se<<endl; cerr<<"----------"; 
#define printdb(i)      printf("%.12lf\n",i)
#define isOn(S, j)      (S & (1<<j))
#define setBit(S, j)    (S |= (1<<j))
#define clearBit(S, j)  (S &= ~(1<<j))
#define toggleBit(S, j) (S ^= (1<<j))
#define lowBit(S)       (S & (-S))
#define setAll(S, n)    (S = (1<<n)-1)
#define turnOffLastBit(S) ((S) & (S-1))
#define turnOnLastZero(S) ((S) | (S+1))
//Can use tuples in C++17
using namespace std;
typedef map < int, int > mii;
typedef vector < int > vii;
typedef vector < ll > vll;
typedef vector < vii > vvi;
typedef pair < int,int > pii;
template <class T> using min_heap = priority_queue<T,vector<T>,greater<T> >;
template <class T> using max_heap = priority_queue<T>;
const db PI =           acos(-1);
const int INF =         0x3f3f3f3f;
const ll LINF =         (ll)2e18;
db eps       =          1e-5;
ll mod       =          (1e9+7);    //998244353   
void print(vector <int> &arr){
    for(int i=0;i<arr.size();i++)
        cout<<arr[i]<<" ";
    
    cout<<endl;
}
void printll(vector <ll> &arr){
    for(int i=0;i<arr.size();i++)
        cout<<arr[i]<<" ";
    
    cout<<endl;
}

ll ncr(ll n, ll r)
{
    r=min(r,n-r);
    ll A[r],i,j,B[r];
    iota(A,A+r,n-r+1);  
    iota(B,B+r,1);     

    ll g;
    for(i=0;i<r;i++)
    for(j=0;j<r;j++)
    {
        if(B[i]==1)
            break;
        g=__gcd(B[i], A[j] );
        A[j]/=g;
        B[i]/=g;
    }
    ll ans=1;
    for(i=0;i<r;i++)
        ans=(ans*A[i]%mod);
    return ans;
}
ll binpow(ll a, ll b, ll m) {
    a %= m;
    ll res = 1;
    while (b > 0) {
        if (b & 1)
            res = res * a % m;
        a = a * a % m;
        b >>= 1;
    }
    return res;
}

const int SIZE=200001;                                //constant SIZE here
bool judge(int a[], int n){
    static int used[SIZE+1];
    for(int i = 1; i <= n; i++) used[i] = 0;
    for(int i = 0; i < n; i++) used[a[i]] = 1;
    for(int i = 1; i <= n; i++) {
        if(!used[i]) return 0;
    }
    return 1;
}
int n,m,r,u,v,idx=1,k=0;
vvi adj(SIZE);
vii color(SIZE,-1), indeg(SIZE,0), outdeg(SIZE,0), level(SIZE,0);
vector <bool> vis(SIZE,false);
stack <int> st;
bool dfs(int u) { 
    color[u] = 1; 
    bool ans=false;
    for (auto i:adj[u]) 
    { 
        if (color[i] == 1) ans = true; 
        if (color[i] == 0 && dfs(i)) ans = true;
    } 
  
    color[u] = 2; 
    return ans; 
} 
vector < set < int > > vv(SIZE);
void dfs2(int u,int par){
	vis[u]=1;
//	dbg(u);
//	dbg(par);
	if(color[u]==-1){
		set < int > s;
		for(auto i:adj[u]) s.insert(color[i]);
		for(auto i:adj[par]) s.insert(color[i]);
		idx=0;
//		dbgs(s);
		while(s.find(idx)!=s.end()){
			idx=(idx+1)%k;
		}
//		dbg(idx);
		color[u]=idx;
	}
	for(auto i:adj[u]){
		if(!vis[i]) dfs2(i,u);
	}
}

int main(){ 
//CONDITION && cout << "YES" || cout << "NO"; cout << '\n';
//////////////////////////////////////////////////////////////////
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  cerr.tie(NULL);
//For fast IO
///////////////////////////////////////////////////////////////////// 
// Have you thought about it enough?
/////////////////////////////////////////////////////////////////////
//  std::cout.unsetf ( std::ios::floatfield );  // floatfield not set
//  std::cout.precision(16);
//  freopen("input.txt","r",stdin);
//  freopen("output.txt","w",stdout);
    ll n;
	cin>>n;
	ll ans=1, num=7;
	while(num%n!=0){
		if(ans>=100000000LL){
			cout<<-1<<endl;
			exit(0);
		}
		ans++;
		num=(1LL*num*10+7LL)%n;
	}
	cout<<ans<<endl;
    return 0;
}


Measured memory_bytes: 20232