#include <stdio.h> int main() { int y = 0; int m = 0; int days1[] = {0,31,28,31,30,31,30,31,31,30,31,30,31}; while (scanf("%d %d", &y, &m) != EOF) { int day = days1[m]; if(y%4==0 && y%100!=0 || y%400==0) { if(...