测试是对的，但过不去，1#WA 5#WA

#include<iostream>
using namespace std;
int main(){
    long long a,b;
    cin>>a>>b;
    if (a%400==0){
        if(b==2){
            cout<<29;
        }
    }else if(a%100==0){
        if(b==2){
            cout<<28;
        }
    }else if(a%100%4==0){
    	if(b==2){
            cout<<29;
        }
	}else{
    	cout<<28;
	}
    if(b==1){
            cout<<31;
    }else if(b==3){
        cout<<31;
    }else if(b==4){
        cout<<30;
    }else if(b==5){
        cout<<31;
    }else if(b==6){
        cout<<30;
    }else if(b==7){
        cout<<31;
    }else if(b==8){
        cout<<31;
    }else if(b==9){
        cout<<30;
    }else if(b==10){
        cout<<31;
    }else if(b==11){
        cout<<30;
    }else if(b==12){
        cout<<31;
        }
    
}