#include<iostream>
#include<math.h>
#include<iomanip>
#include<vector>
#include<algorithm>
#include<queue>
#include<string>
#include<stdlib.h>
using namespace std;
#define PI 3.14159265358979
typedef  long long ll;
#define rep(i,n) for(int i=0;i<n;i++)
#include<set>
//---------------------------------------------
 
int main(void)
{
string s;

cin>>s;

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


}