#include<iostream>
using namespace std;
int main ()
{
    int x;
    cin>>x;
    if(x>=0 && x<=9)
    {
        cout<<1;
    }
    else

        if(x>=10 && x<=99)
        {
            cout<<2;
        }

    else
    {
        if(x>=100 && x<=999)
        {
            cout<<3;
        }
    }
}