#include <stdio.h>

int main(void) {
    int i, j, k, count = 0;
    
    for (i = 1; i <= 12; i++) {
        for (j = 0; j <= 3; j++) {
            for (k = 1; k <= 9; k++) {
                if (i == j + k) count++;
            }
        }
    }
    
    printf("%d", count);
    
    return 0;
}