#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;