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

#define BIT(x) (1ull << (x))
#define FOR(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define RFOR(i, a, b) for (int i = (int)(b) - 1; i >= (int)(a); i--)
#define RREP(i, n) RFOR(i, 0, n)
#define EACH(i, v) for (__typeof((v).begin()) i = (v).begin(); i != (v).end(); ++i)
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define UNIQ(v) do {sort(ALL(v)); (v).erase(unique(ALL(v)), (v).end());} while (0)
#define PB push_back
#define MP make_pair
#define SIZE(v) ((int)(v).size())
#define DEBUG(x) cout << #x << " = " << x << endl


int dist(int sx, int sy, int tx, int ty)
{
	return abs(sx - tx) + abs(sy - ty);
}

int norm(int x, int y)
{
	return x * x + y * y;
}


int main()
{
	int x, y, r;
	scanf("%d %d %d", &x, &y, &r);
	
	int res = 0;
	FOR(i, -300, 300){
		FOR(j, -300, 300){
			if (norm(x - i, y - j) <= r * r) res = max(res, dist(0, 0, i, j) + 1);
		}
	}
	
	printf("%d\n", res);
}