#include <bits/stdc++.h>

/* strict input checker */

int read_int() {
	int c = getchar(), s = 0, res = 0;
	if (c == '-') s = 1, c = getchar();
	assert('0' <= c && c <= '9');
	if (s) assert(c != '0');
	res = c - '0';
	while (1) {
		c = getchar();
		if (c < '0' || c > '9') break;
		assert(res <= 200000000); // avoid overflow
		assert(res); // no leading-zero
		res = res * 10 + c - '0';
	}
	ungetc(c, stdin);
	return s ? -res : res;
}
void read_linebreak() {
	int c = getchar();
	if (c == '\r') c = getchar();
	assert(c == '\n');
}

int main() {
	for (int i = 0; i < 10; i++) {
		int n = read_int();
		assert(getchar() == ' ');
		int p = read_int();
		assert(getchar() == ' ');
		int x = read_int();
		assert(getchar() == ' ');
		int y = read_int();
		read_linebreak();
		
		assert(1 <= n && n < 1000);
		assert(n & 1);
		assert(1 <= p && p <= 1000000000);
		assert(0 <= x && x <= p);
		assert(0 <= y && y <= p);
	}
	assert(getchar() == EOF);
	return 0;
}