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 (GCC 5.4.1) (judge verdict: Time Limit Exceeded)

#include<stdio.h>
int main()
{
	int r,g,b,n;
	int counter=0;
	int i,j,k;
	scanf("%d %d %d %d",&r,&g,&b,&n);
	for(i=0;i<=n/r;i++){
		for(j=0;j<=(n-r*i)/g;j++){
			for(k=0;k<=(n-r*i-g*j)/b;k++){
				if(r*i+g*j+b*k==n){
					counter+=1;
				}
			}
		}
	}
	printf("%d",counter);
}