#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define REP(i,n) for(ll i=0; i<(ll)(n); i++)
#define REPM(i,n) for(ll i=(n-1); 0=<i; i--)
#define VI vector<int>
#define VL vector<ll>
#define VD vector<double>
#define VS vector<string>
#define V_SORT_U(x) sort(x.begin(), x.end());
#define V_SORT_D(x) sort(x.begin(), x.end(),greater<int>());
#define V_SUM(x) accumulate(x.begin(), x.end(), 0)
#define STR_TRANS_UP(x) transform(x.begin(), x.end(), x.begin(), ::toupper);
#define STR_TRANS_LOW(x) transform(x.begin(), x.end(), x.begin(), ::tolower);

int main(void){
    string S;
    cin >> S;

    REP(i,3)
    {
        if ( S.at(i) == '7')
        {
            cout << "Yes" << endl;
            return 0;
        }
    }

    cout << "No" << endl;
    return 0;
}