#include<stdio.h>

   void daysinmonth(int Month){
    switch(Month)
    {
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
        printf("31 days\n");
        break;
                case 4:
                case 6:
                case 9:
                case 11:
        printf("30 days\n");
        break;
        case 2:
        printf("28 or 29 days\n");
        default:
         printf("Invalid input");
        
    }
   }


int main()
{
    int Month;
   while (scanf("%d",&Month)!=1)
   {
  while(getchar()!='\n');
   }
   
   
      if(Month<=0||Month>=13)
   {
       printf("Invalid input");
       return 0;
       
   }
   dayinmonth(Month);
   return 0;
}