#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>

#define rep(i,n) for(i=0; i<n; ++i)
#define in(a) cin >> a
#define out(a,b) cout << a << b
using namespace std;
using lint = long long;

int main(void){
    int i, j, a, b, c, cnt = 0;

    rep(i,12){
        rep(j,31){
            if((i+1)==2 && (j+1)>28)    continue;
            if((i+1)==4 && (j+1)>30)    continue;
            if((i+1)==6 && (j+1)>30)    continue;
            if((i+1)==9 && (j+1)>30)    continue;
            if((i+1)==11 && (j+1)>30)    continue;
            cnt+=((i+1)==((j+1)/10+(j+1)%10));
        }
    }

    out(cnt,endl);

    return 0;
}