#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;
}
