#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll fun(ll x){
    ll cnt=0;
    while(x){
     ll tmp=x%10;
     if(tmp==2)cnt++;
     x/=10;
    }
    return cnt;
}
int main(){
    ll ans=2;
    for(int i=13;i<=2020;i++)ans+=fun(i);
    cout<<ans;
    return 0;
}