Problem:
Score : 200 points

Problem Statement

Snuke has come to a store that sells boxes containing balls. The store sells the following three kinds of boxes:

Red boxes, each containing R red balls

Green boxes, each containing G green balls

Blue boxes, each containing B blue balls

Snuke wants to get a total of exactly N balls by buying r red boxes, g green boxes and b blue boxes.
How many triples of non-negative integers (r,g,b) achieve this?

Constraints

All values in input are integers.

1 \leq R,G,B,N \leq 3000

Input

Input is given from Standard Input in the following format:

R G B N

Output

Print the answer.

Sample Input 1

1 2 3 4

Sample Output 1

4

Four triples achieve the objective, as follows:

(4,0,0)

(2,1,0)

(1,0,1)

(0,2,0)

Sample Input 2

13 1 4 3000

Sample Output 2

87058

Solution in C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

namespace atcoder
{

    namespace atcoder
    {
        class Program
        {
            static void Main(string[] args)
            {
                string[] input = Console.ReadLine().Split(' ');
                int r = int.Parse(input[0]);
                int g = int.Parse(input[1]);
                int b = int.Parse(input[2]);
                int n = int.Parse(input[3]);
                int i = int.Parse(input[7]);
                int j = int.Parse(input[6]);
                int k = int.Parse(input[5]);
                int x = int.Parse(input[4]);
                if (r * i + g * j + b * k == n && n == x)
                {
                    Console.WriteLine(x);
                }
            }
        }
    }
}