#include<stdio.h>
int main()
{
	int a, b, c, d;
	scanf("%d %d %d %d", &a, &b, &c, &d);
	if (b - a + 31 < d)
		printf("3\n");
	else if (b - a + 31 < c)
		printf("2\n");
	else
		printf("1\n");
	return 0;
}