#include <stdio.h>
#include <string.h>
#include <stdbool.h>

int main() {
    int n; scanf("%d", &n);
    if (n / 100 == 7 || n / 10 % 10 == 7 || n % 10 == 7)
        printf("Yes\n");
    else
        printf("No\n");
}