#include <stdio.h>
int main(void){
  char a, b, c;
  char buf;
  fgets(buf, sizeof(buf), stdin);
  sscanf(buf, "%c%c%c", a, b, c);
  if (a="7" || b="7" || c="7"){
    printf("Yes");
  }
  else{
    printf("No");
  }
  return 0;
}