a148: You Cannot Pass?! FYI: https://yunlinsong.blogspot.com/2015/02/you-cannot-pass.html

a148.cpp

#include <cmath>
#include <cstdio>

using namespace std;

int main(void){
	int num = 0;
	float score = 0;
	double average = 0.0;

    while(scanf("%d", &num) != EOF)
    {
		average = 0.0;
		for(int i = 1; i <= num; i++)
		{
			scanf("%f", &score);
			average += (score / num);
			
			//printf("average:%lf\n", average);
		}

		if( average > 59)
			printf("no\n");
		else
			printf("yes\n");
    }

    return 0;
}