#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 CorrectMultiplication { public:
	long long getMinimum(int a, int b, int c)
	{
		return solve(a,b,c);
	}

	LL solve(LL a, LL b, LL c)
	{
		if( a > b )
			swap(a,b);
		LL vv = (1LL<<62);
		for(LL A=1; A*A <= (a+b+c)*2; ++A)
			vv = min(vv, best_of(A,a,b,c));
		return vv;
	}

	LL best_of(LL A, LL a, LL b, LL c)
	{
		LL Bl = 1;
		LL Br = a+b+c;
		while( Bl+3 < Br )
		{
			LL Bc1 = (Bl*2+Br*1) / 3;
			LL Bc2 = (Bl*1+Br*2) / 3;
			LL cc1 = abs(A-a)+abs(Bc1-b)+abs(A*Bc1-c);
			LL cc2 = abs(A-a)+abs(Bc2-b)+abs(A*Bc2-c);
			if(cc1 < cc2)
				Br = Bc2;
			else
				Bl = Bc1;
		}
		LL vv = (1LL<<62);
		for(LL B=Bl; B<=Br; ++B)
			vv = min(vv, abs(A-a)+abs(B-b)+abs(A*B-c));
		return vv;
	}
};

// 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 long long& Expected, const long long& 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(_, CorrectMultiplication().getMinimum(a, b, c));}
int main(){

CASE(0)
	int a = 19; 
	int b = 28; 
	int c = 522; 
	long long _ = 2LL; 
END
CASE(1)
	int a = 10; 
	int b = 30; 
	int c = 500; 
	long long _ = 11LL; 
END
CASE(2)
	int a = 11111; 
	int b = 11111; 
	int c = 123454321; 
	long long _ = 0LL; 
END
CASE(3)
	int a = 1000; 
	int b = 100; 
	int c = 10; 
	long long _ = 1089LL; 
END
CASE(4)
	int a = 399; 
	int b = 522; 
	int c = 199999; 
	long long _ = 24LL; 
END
CASE(5)
	int a = 1000000000; 
	int b = 1000000000; 
	int c = 1000000000; 
	long long _ = -1LL; 
END
/*
CASE(6)
	int a = ; 
	int b = ; 
	int c = ; 
	long long _ = LL; 
END
*/
}
// END CUT HERE
