#include
main()
{
int mouth,n;
printf("input year :");
scanf("%d",&n);
printf("input mouth:");
scanf("%d",mouth);
switch(mouth)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:printf("31days\n");break;
case 4:
case 6:
case 9:
case 11:printf("30 days\n");break;
case 2:
if(n%4==0&&n%100!=0||n%100==0&&n%400==0)
printf("29 days\n");
else
printf("28 days\n");
default:printf("error");break;
}
}
