#include<stdio.h>
int main()
{
    int N,a,b,c,y,z;
    scanf("%d",&N);
    a=N%10;
    y=N/10;
    b=y%10;
    z=y/10;
    c=z%10;

    if(a==7)
    {
         printf("Yes\n");
     }
     else if (b==7)
    {
         printf("Yes\n");
    }
    else if(c==7)
    {
        printf("Yes\n");
     }
    else
    {
         printf("No\n");
     }
     return 0;