#include <bits/stdc++.h>
using namespace std;

int main(int argc, char const* argv[])
{
    int counter=0;
    long int N;
    int b;
    cin>>N;
    int a=1000000007;
    if(a>N){
        b=a/N;
    }
    else if(N>a){
        b=N/a;
    }
    else{
        counter=0;
        cout<<counter<<endl;
        return 0;
    }
    for (int i = b; i >= 10; i=i/10) {

        counter+=1;
    }
    cout<<counter<<endl;
    return 0;
}