#include <iostream> using namespace std; int main() { int y, m, d, ds; cin >> y >> m >> d; cin >> ds; int sum =0; int date[12] ={31,28,31,30,31,30,31,31,30,31,30,31}; for(int i =0; i < m -1; i++){ sum +=date[i]; } sum +=d; if(((y % 4 ==0 && y % 100 !=0) || y % 400 ==...