public static int Uruudoshi(int year)
{
return (((year + 1) % 4) * ((year + 2) % 4) * ((year + 3) % 4) * (year % 100))
+ (((year + 1) % 4) * ((year + 2) % 4) * ((year + 3) % 4)) *
((year - (year % 100)) *
((((year - (year % 100)) + 100) / 100) % 4) *
((((year - (year % 100)) + 200) / 100) % 4) *
((((year - (year % 100)) + 300) / 100) % 4));
}