2054：【例3.4】适合晨练-信息学奥赛一本通

#include<algorithm>

#include<cmath>

#include<cstdio>

#include<iostream>

using namespace std;

int main(){

int t;

cin>>t;

if(25<=t and t<=30){

cout<<"ok!";

}

else{

cout<<"no!";

}

return 0;

}