#include <iostream>

int main() {
    int m;
    int d;
    int d_num;
    int d_u;
    int d_l;
    int ans = 0;
    
    for (int m = 1; m < 13; m++) {
        switch(m) {
            case 2:
                d_num = 28;
                break;
            case 4:
            case 5:
            case 6:
            case 9:
            case 11:
                d_num = 30;
                break;
            default:
                d_num = 31;
                break;
        }
        
        for (d = 1; d <= d_num; d++) {
            if (d < 10) d_u = 0;
            else d_u = d / 10;
            
            d_l = d % 10;
            
            
            if (m == (d_u + d_l)) ans += 1;
        }
    }
    
    std::cout << ans << std::endl;
	
	return 0;
}