#include<stdio.h>
 int main(void){
     int count = 0;
     for(int i = 0; i < 3;i++){
         for(int l=1; l < 10;l++){
             switch(i+l){
                 case 1:
                 case 2:
                 case 3:
                 case 4:
                 case 5:
                 case 6:
                 case 7:
                 case 8:
                 case 9:
                 case 10:
                 case 11:
                 case 12:
                    count +=1;
                    break;
             }
         }
     }
     printf("%d", count + 1); 
}