#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <functional>
#include <complex>
#include <queue>
#include <stack>
#include <cmath>
#include <cassert>
#include <cstring>
using namespace std;
typedef long long LL;
typedef complex<double> CMP;

class RadarFinder { public:
	int possibleLocations(int x1, int y1, int r1, int x2, int y2, int r2) 
	{
		if( x1==x2 && y1==y2 )
			return r1==r2 ? -1 : 0;
		LL rr = LL(x1-x2)*(x1-x2) + LL(y1-y2)*(y1-y2);
		LL p12 = LL(r1+r2)*(r1+r2);
		LL m12 = LL(r1-r2)*(r1-r2);
		if( rr > p12 )
			return 0;
		else if( rr == p12 )
			return 1;
		else
			if( rr < m12 )
				return 0;
			else if( rr == m12 )
				return 1;
			else
				return 2;
	}
};

// BEGIN CUT HERE
#include <ctime>
double start_time; string timer()
 { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
 { os << "{ ";
   for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
   os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
void verify_case(const int& Expected, const int& Received) {
 bool ok = (Expected == Received);
 if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
 cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
#define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
#define END	 verify_case(_, RadarFinder().possibleLocations(x1, y1, r1, x2, y2, r2));}
int main(){

CASE(0)
	int x1 = 0; 
	int y1 = 0; 
	int r1 = 13; 
	int x2 = 40; 
	int y2 = 0; 
	int r2 = 37; 
	int _ = 2; 
END
CASE(1)
	int x1 = 0; 
	int y1 = 0; 
	int r1 = 3; 
	int x2 = 0; 
	int y2 = 7; 
	int r2 = 4; 
	int _ = 1; 
END
CASE(2)
	int x1 = 0; 
	int y1 = 0; 
	int r1 = 5; 
	int x2 = 10; 
	int y2 = 10; 
	int r2 = 3; 
	int _ = 0; 
END
CASE(3)
	int x1 = 0; 
	int y1 = 0; 
	int r1 = 1; 
	int x2 = 0; 
	int y2 = 0; 
	int r2 = 1; 
	int _ = -1; 
END
CASE(4)
	int x1 = 1; 
	int y1 = 1; 
	int r1 = 1; 
	int x2 = 1; 
	int y2 = 1; 
	int r2 = 2; 
	int _ = 0; 
END
CASE(5)
	int x1 = -100000000; 
	int y1 = -100000000; 
	int r1 = 141421357; 
	int x2 = 100000000; 
	int y2 = 100000000; 
	int r2 = 141421357; 
	int _ = 2; 
END
CASE(6)
	int x1 = 0;
	int y1 = 0;
	int r1 = 5;
	int x2 = 1; 
	int y2 = 0; 
	int r2 = 4; 
	int _ = 1; 
END
CASE(7)
	int x1 = -1000000000;
	int y1 = -1000000000;
	int r1 =  1000000000;
	int x2 =  -999999999; 
	int y2 =  1000000000; 
	int r2 =  1000000000; 
	int _ = 0;
END

}
// END CUT HERE
