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

int main(){
    int n,a,b,c;
    cin>>n;
    a=n/100;
    b=n/10-10*a;
    c=n%10;
    
    if(a==7||b==7||c==7) cout<<"Yes";
    else cout<<"No";
    return 0;
}