#include <stdio.h>

int main(void)
{
    int day[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int count = 0;
    int i, j;

    for (i = 0; i < sizeof(day)/sizeof(day[0]); i ++){
        for (j = 1; j < day[i]; j++){
            if ((i+1) == (j/10) + (j%10)){
                count++;
            }
        }
    }
    printf("%d\n" ,count);
    return 0;
}