#include <stdio.h>

int main(int argc, char *argv[]){
    int a[] = {31,28,31,30,31,30,31,31,30,31,30,31};
    int b = 0;
    
    for(int i = 0; i< 12; i++)
    {
        for(int j = 1; j <= a[i]; j++)
        {
            if( i + 1 == j / 10 + j % 10) b++;
        }
    }

    
    printf("%d\n", b);

    return 0;
}