1

#include <bits/stdc++.h>
using namespace std;
struct cr{
    int x,y,r;
};
int main(){
    cr a,b;
    double d;
    cin>>a.x>>a.y>>a.r;
    cin>>b.x>>b.y>>b.r;
    d=(a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y);
    if(a.x==b.x && a.y==b.y && a.r==b.r)
        cout<<-1;
    else
        if((a.r+b.r)*(a.r+b.r)==d || (a.r-b.r)*(a.r-b.r)==d)
            cout<<1;
        else
            if((a.r+b.r)*(a.r+b.r)<d || (a.r-b.r)*(a.r-b.r)>d)
                cout<<0;
            else
                cout<<2;
}