#include <stdio.h> int main() { double price = 0.0; int month = 0; int day = 0; int discount = 0; double count = 0.0; scanf("%lf %d %d %d",&price,&month,&day,&discount); if (month == 11 && day == 11) { count = price*0.7; if (discount == 1) { count -= 50...