#include<stdio.h>
int firstday1(int year,int month)
{
int firstday;
int c;
int y;
int m;
firstday=0;
if(month<3)
{
m=month+12;
year=year-1;
}
else
{
m=month;
}
c=(year/1000)*10+(year%1000)/100;
y=(((year%1000)%100)/10)*10+(((year%1000)%100)%10);
firstday=(y+(y/4)+(c/4)-2*c+(26*(m+1)/10))%7;
return firstday;
}
void printcalender(int firstday,int days)
{
}
int main()
{
int year,month,days;
int firstday;
scanf("%d%d",&year,&month);
firstday=firstday1(year,month);
if((year%100==0&&year%400==0)||(year%100!=0&&year%4==0))
{
if(month==2)
{days=29;}
else if(month==4||month==6||month==9||month==11)
{days=30;}
else
{days=31;}
}
else
{
if(month==2)
{days=29;}
else if(month==4||month==6||month==9||month==11)
{days=30;}
else
{days=31;}
}
return 0;
}

。