#include<bits/stdc++.h>
using namespace std;
int main(){
	int N;
	cin>>N;
	int a=N/100;
	int b=N%100/10;
	int c=N-a*100-b*10;
	if(a==7||b==7||c==7){
		cout<<"Yes";
	}
	else{
		cout<<"No";
	}
	return 0;
}