#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
    int a, b, c;
    scanf("%d %d %d", &a, &b, &c);
    int val = (a + b + c) / 3;
    if (val < 60)
        printf("YES");
    else
        printf("NO");
    return 0;
}

#include <stdio.h>
int main()
{
    int count = 0;
    scanf("%d", &count);
    while (count--)
        printf("Happy new year!Good luck!\n");
    return 0;
}


#include<stdio.h>
int main() {
    int n = 0;
    long long s = 0;
    scanf("%d", &n);
    int i = 0;
    for (i = 1; i <= n; i++) {
        s += i;
    }
    printf("%ld", s);
    return 0;
}