#include <stdio.h>
int main() {
int math = 0;//初始化
int chinese = 0;
int english = 0;
scanf("%d %d %d", &math, &chinese, &english);//输入成绩
int average = (math + chinese + english) / 3;//平均成绩
if (average >= 60)//判断
{
printf("NO\n");
}
else
{
printf("YES\n");
}
return 0;
}

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