#include <iostream>
int main() {
    int n;
    std::cout << "请输入小明的考试成绩: ";
    std::cin >> n;
    if (n >= 90) {
        std::cout << "yes" << std::endl;
    }
    return 0;
}    
/**************************************************************
	Problem: 1301
	User: fandaohan
	Language: C++
	Result: Wrong Answer
****************************************************************/