Проблем със задача: "examSchedule" от C# Basics Exam 12 April 2014 Evening

Judge ми дава 87/100 точки. Тест 4 ми гърми и немога да разбера защо...

Входа на теста е:

11
1
AM
2
59

Очаквания изход е:

02:00:PM

Моят изход е абсолютно същия. Аз ли бъркам някъде или Judge...?

Ето го и кода ми:

using System;

class ExamSchedule
{
static void Main()
{
int examStartingHour = int.Parse(Console.ReadLine());
int examStartingMinute = int.Parse(Console.ReadLine());
string partOfTheDay = Console.ReadLine();
int durationHours = int.Parse(Console.ReadLine());
int durationMinutes = int.Parse(Console.ReadLine());

int totalExamStartingInMinutes = (examStartingHour * 60) + examStartingMinute;
int totalDurationInMinutes = (durationHours * 60) + durationMinutes;

int endExamTotalMinutes = totalExamStartingInMinutes + totalDurationInMinutes;

int endExamInHours = endExamTotalMinutes / 60;
int endExamInMinutes = endExamTotalMinutes % 60;

if (partOfTheDay == "AM")
{
if (endExamInHours < 12)
{
Console.WriteLine("{0:00}:{1:00}:AM", endExamInHours, endExamInMinutes);
}
else if (endExamInHours == 12)
{
Console.WriteLine("{0:00}:{1:00}:PM", endExamInHours, endExamInMinutes);

}
else
{
endExamInHours -= 12;
Console.WriteLine("{0:00}:{1:00}:PM", endExamInHours, endExamInMinutes);
}
}
if (partOfTheDay == "PM")
{
if (endExamInHours < 12)
{
Console.WriteLine("{0:00}:{1:00}:PM", endExamInHours, endExamInMinutes);
}
else if (endExamInHours == 12)
{
Console.WriteLine("{0:00}:{1:00}:AM", endExamInHours, endExamInMinutes);

}
else
{
endExamInHours -= 12;
Console.WriteLine("{0:00}:{1:00}:AM", endExamInHours, endExamInMinutes);
}
}
}
}