/** 
 *  Author : Parth Prajapati aka (PARTH_4399, hungry_chef)
 * 	Institute : Pandit Deendayal Petroleum University
**/
#include<bits/stdc++.h>

using namespace std; 

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    string s;
    cin>>s;
    if(s[0] == '7' || s[1] == '7' || s[2] == '7')
        cout<<"Yes";
    else cout<<"No";
	return 0;
}