```cpp
#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,y;
    cin>>n>>y;
    if(y==1||y==3||y==5||y==7||y==8||y==10||y==12)
    {
        cout<<"31";
    }
    else if(y==4||y==6||y==9||y==11)
    {
        cout<<"30";
    }
    else  if(n%4==0&&n%100!=0||n%400==0)
    {
        cout<<"29";
    }
    else cout<<"28";
    return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a%40&&a%100>0||a%4000) { if(b1) { cout<<"31"; } if(b2) { cout<<"29"; }

	if(b==3)
    {
        cout<<"31"; 
    }

	if(b==4)
    {
        cout<<"30";
    }
	if(b==5)
    {
        cout<<"31";	
    }
	if(b==6)
    {
        cout<<"30";
    }
	if(b==7)
    {
        cout<<"31";
    }
	if(b==8)
    {
        cout<<"31";
    }
	if(b==9)
    {
        cout<<"30";
	}
	if(b==10)
	{
    	cout<<"31";
	}
	if(b==11)
	{
    	cout<<"30";
	}
	if(b==12)
    {
		cout<<"31";
	}
}
else
{
if(b==1)
	{
 		cout<<"31";    
	} 
	if(b==2)
	{
    	cout<<"28";
	}
	if(b==3)
	{
    	cout<<"31";
	}
	if(b==4)
	{
    	cout<<"30";
	}
	if(b==5)
	{
    	cout<<"31";
	}
	if(b==6)
	{
    	cout<<"30";
	}
	if(b==7)
	{
    	cout<<"31";
	}
	if(b==8)
	{
    	cout<<"31";
	}
	if(b==9)
	{
    	cout<<"30";
	}
	if(b==10)
	{
    	cout<<"31";
	}
	if(b==11)
	{
    	cout<<"30";
	}
	if(b==12)
	{
    	cout<<"31";
	}
}
return 0;

}

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,n;
    cin>>a>>b;
    if(b==1||b==3||b==5||b==7||b==8||b==10||b==12)
    {
        cout<<"31";
    }
    else if(b==2)
    {
        if(a%4==0 && a%100!=0 || a%400==0)
        {
            cout<<"29";
        }
        else cout<<"28";
    }
    else cout<<"30";
	return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int y,m;
    cin>>y>>m;
    if(m==1 || m==3 || m==5 || m==7 || m==8 || m==10 || m==12) cout<<31;
    else if(m==4 || m==6 || m==9 || m==11) cout<<30;
    else if(y%4==0 && y%100!=0 || y%400==0) cout<<29;
    else cout<<28;
    return 0;
}  

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,m;
	cin>>n>>m;
	int a[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
	bool w=0;
	if(n%100==0){
		if(n%400==0) w=1;
	}
	else if(n%4==0) w=1;
	if(w&&m==2) cout<<29;
	else cout<<a[m];
	return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b;
    cin>>a>>b; 
    if(b==1 || b==3 || b==5 || b==7 || b==8 || b==10 || b==12) cout<<"31";
    else if(b==4 || b==6 || b==9 || b==11) cout<<"30";
    else if(a%4==0 && a%100!=0 || a%400==0) cout<<"29";
    else cout<<"28";
	return 0;
}