#include <stdio.h>
#undef NDEBUG
#include <assert.h>

int main()
{
	static const char days_in_month[] = {31,30,31,30,31,31,30,31,30,31,31,29};
	for (int i=0; i<366; i++) {
		int months, remdays;
		remdays = i;
		for (months=0; days_in_month[months] <= remdays; months++)
			remdays -= days_in_month[months];
		int months2, remdays2;
		remdays2 = i;
		months2 = (remdays2 * 535 + 333) >> 14;
		remdays2 -= (979 * months2 + 16) >> 5;
		assert(months2==months && remdays2 == remdays);
		//printf("%d %d %d\n", i, months2, remdays2);
	}
}