C :

#include <stdio.h>

int getNum(int n){
	if(n == 1)
		return 1;
	else
		return getNum(n-1) + n - 1;

}


void main()
{
	int s = 0,i = 1;
	
	while(s <= 5000){
		s += getNum(i);
		i++;
	}
	printf("%d",s);
	
}

C++ :

#include<iostream>
using namespace std;


int digui(int n);

int main(){
	
	int s=0,k=1;
	

	while(s<=5000){
		s=s+digui(k);
		k++;
	}
	cout<<s<<endl;
	
}

int digui(int n){

	if(n==1){
		return 1;
	} else{
	
		return (n-1)+digui(n-1);
	}
}

Python :

def shu(n):
    r = 0;
    if n == 1:
       r = 1;
    else:
       r = shu(n - 1) + n - 1 
    return r;

i = 1
s = 0
while s < 5000:
    s += shu(i)
    i += 1

print(s)