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#include <bits/stdc++.h>
using namespace std;

int main()
{
    int thang, nam;
    cout<<"thang:";
    cin>>thang;
    cout<<"nam:";
    cin>>nam;
    if(thang==1 || thang==3 || thang==5 || thang==7 || thang==8 || thang==10 || thang==12)
        cout << "Co 31 ngay";

    else if(thang==4 || thang==6 || thang==9 || thang==11)
        cout << "Co 30 ngay";

    else if(thang==2)
    {
        if((nam%4==0 && nam%100!=0) || nam%400==0)
            cout << "Co 29 ngay";
        else
            cout << "Co 28 ngay";
    }

    return 0;
}
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