#include<iostream>
#include <cmath>

using namespace std;

int main() {

int a,b,c,count=0;
cin>>a>>b>>c;
int d=0;
if (b-a>c-b) {
    d=b-a;
}else {
d=c-b;
}

while (d!=1) {
    if (d%2==0) {
        d/=2;
        count++;
    }else {
        d=(d+1)/2;
        count++;
    }
}

cout<<count;
    return 0;
}