// yukicoder: 281 門松と魔法(1)
// 2019.6.3 bal4u

#include <stdio.h>

#define INF 0x55555555

int check(int *h) {
	if (h[0] == h[1] || h[1] == h[2] || h[0] == h[2]) return 0;
	if (h[0] < h[2]) {
		return (h[1] < h[0] || h[1] > h[2]);
	} else {
		return (h[1] > h[0] || h[1] < h[2]);
	}
}

int d, ans;
void rec(int *h, int id, int c) {
	int i, t;
	if (id == 3) {
		if (check(h) && c < ans) ans = c;
		return;
	}
	t = h[id];
	for (i = 0; i <= 2; i++) {
		if (h[id] < 0) h[id] = 0;
		rec(h, id+1, c+i);
		if (h[id] == 0) break;
		h[id] -= d;
	}
	h[id] = t;
}

void cutr(int h1, int h2, int h3) {
	int g[3];
	g[0] = h1, g[1] = h2;
	int t = (h3-h2-1)/d+1;
	h3 -= t*d;
	if (h3 < 0) h3 = 0;
	g[2] = h3;
	if (check(g)) {
		if (t < ans) ans = t;
		return;
	}
	h3 -= d;
	if (h3 < 0) h3 = 0;
	g[2] = h3, t++;
	if (check(g)) {
		if (t < ans) ans = t;
	}
}

void cutc(int h1, int h2, int h3) {
	int g[3];
	g[0] = h1, g[2] = h3;
	int t = (h2-h1-1)/d+1;
	h2 -= t*d;
	if (h2 < 0) h2 = 0;
	g[1] = h2;
	if (check(g)) {
		if (t < ans) ans = t;
		return;
	}
	h2 -= d;
	if (h2 < 0) h3 = 0;
	g[2] = h2, t++;
	if (check(g)) {
		if (t < ans) ans = t;
	}
}

int main()
{
	int h[3];

	scanf("%d%d%d%d", &d, h, h+1, h+2);
	if (d == 0) {
		puts(check(h)? "0": "-1");
		return 0;
	}
	ans = INF;
	rec(h, 0, 0);
	if (ans == INF) {
		if (h[0] < h[1] && h[1] < h[2]) {
			cutr(h[0], h[1], h[2]);
			cutc(h[0], h[1], h[2]);
		}
		else if (h[0] > h[1] && h[1] > h[2]) {
			cutr(h[2], h[1], h[0]);
			cutc(h[2], h[1], h[0]);
		}
	}
	if (ans == INF) ans = -1;
	printf("%d\n", ans);
	return 0;
}