#include <iostream>
using namespace std;

bool isSubset(int *list, int m) {
    int size = sizeof(list)/sizeof(*list);
    for(int i=0; i<size; i++) {
        if(list[i] == m) return true;
    }
    return false;
}

int main() {
    int ans(0), DAY;
    int M(1), D(1);
    int h31[] = {1,3,5,7,8,10,12},
        h30[] = {4,6,9,11},
        h28[] = {2};
    for(int i=0; i<12; i++, M++){
        if(isSubset(h31, M))        DAY = 31;
        else if(isSubset(h30,M))    DAY = 30;
        else if(isSubset(h28,M))    DAY = 28;
        for(int j=0; j<DAY; j++) {
            if(M == D/10 + D%10) ans++;
        }
    }
    cout << ans << "\n";
    return 0;
}