積分累計簽到

Console.WriteLine("請輸入天數"); int day = Convert.ToInt32(Console.ReadLine());

int d = day / 7; int d1 = day % 7; int sum = 0; int r = 0; sum = d * 28; for (int i = 1; i <=7; i++) { for (int j = i; j <=d1; j++) { r += j; } i = 7; } Console.WriteLine(sum+r); Console.ReadLine();