#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){
                 case1:
                 case2:
                 case3:
                 case4:
                 case5:
                 case6:
                 case7:
                 case8:
                 csae9:
                 case10:
                 case11:
                 csae12:
                    count++;
                    break;
             }
         }
     }
     printf("%d", count); 
}