#include <iostream>
using namespace std;

int main() {
    int one[]  = {1,3,5,7,8,10,12};
    int zero[] = {4,6,9,11};
    int answer = 0;
    
    for(int j = 0; j < sizeof(one)/sizeof one[0]; j++){
        for(int i = 1; i <= 31; i++){
            if((i/10)+(i%10) == one[j]){
                answer++;
            }
        }
    }
    
    for(int j = 0; j < sizeof(zero)/sizeof zero[0]; j++){
        for(int i = 1; i <= 30; i++){
            if((i/10)+(i%10) == zero[j]){
                answer++;
            }
        }
    }
    
    
    for(int i = 1; i <= 28; i++){
        if((i/10)+(i%10) == 2){
            answer++;
        }
    }
    cout << answer << "\n";
    
    return 0;
}