#include <iostream>
#include<math.h>
#include<string.h>
#include<string>
#include<algorithm>
#include<stdio.h>
#include<queue>
#define N 100000
#define INF 0xffffff
using namespace std;
typedef long long LL;
int main() {
int i,j,count,len;
char s[4];
count=0;
for(i=1;i<=2020;i++){
len=sprintf(s,"%d",i);
for(j=0;j<len;j++)if(s[j]=='2')count++;
}
cout<<count;
return 0;
}
//624