#include<iostream>
#include<iomanip>
#include<vector>
#include<string>
#include<cstring>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<algorithm>
#include<cmath>
#include<cstdio>
#include<cstdlib>
#include<climits>
#include<fstream>

#define MOD (1000000007)

using namespace std;

typedef long long int Int;

constexpr Int TEN(int n) { return n == 0 ? 1 : 10 * TEN(n-1); }

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

    if(s[0] == '7' || s[1] == '7' || s[2] == '7') {
        cout<<"Yes"<<endl;
    } else {
        cout<<"No"<<endl;
    }

    return 0;
}
