#include <stdio.h>
int main(void){
    int month[12]={31,28,31,30,31,30,31,31,30,31,30,31};
    int x,y,a,b,count=0;
    for(x=0;x<12;x++){
        for(y=month[x];y>0;y--){
            a=y/10;
            b=y%10;
            if((x+1)==a+b){
                count++;
            }
        }
    }
    printf("%d\n",count);
    
    return 0;
}