#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define itn int
#define rep2(i,a,n) for(int i = (a);i < (n);i++)
#define rep(i,n) rep2(i,0,n)
using P = pair<int,int>;

int main(void){
    int ans = 0;
    
    for(int i = 0;i <= 3;i++){
        for(int j = 0;j <= 9;j++){
            if(i == 0 && j == 0)continue;
            if(i * 10 + j > 31)continue;
            
            if(i + j <= 12)ans++;
        }
    }
    cout << ans << endl;
}