C :

#include<stdio.h>
int main()
{
    int a,b,c;
    int i=0;
    float sum=0.0;
    float q;
    while(scanf("%d %d %d",&a,&b,&c)!=EOF)
    {
            for(i=1;i<=a;i++)sum+=i;
            for(i=1;i<=b;i++)sum+=(i*i);
            for(i=1;i<=c;i++)
            {
                             q=(float)1/i;
                             sum+=q;
            }
            printf("%.2f",sum);
            sum=0;
    }
    return 0;
}

C++ :

#include <iostream>
#include <stdio.h>
//#include <conio.h>
using namespace std;

int main()
{
	double a,b,c,i,sum;
	cin >> a >> b >> c;
	sum = (1+a)*a/2;
	for (i = 1 ; i<=b ; i++) {
		sum += i*i;
	}
	for (i = 1 ; i<=c ; i++) {
		sum += 1/i;
	}
	printf("%.2f\n", sum);
	//_getch();
	return 0;
}

Java :

import java.util.Scanner;

public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		Scanner input = new Scanner(System.in);
		
		int a = input.nextInt();
		int b = input.nextInt();
		int c = input.nextInt();
		int aSum = 0,bSum = 0;
		double cSum = 0,Sum = 0;
		for(int i = 1 ; i <= a; i ++){
			aSum += i;
		}
		for(int i = 1 ; i <= b; i ++){
			bSum += (i*i);
		}
		for(int i = 1 ; i <= c; i ++){
			cSum += (1.0/i);
		}
		Sum = aSum + bSum + cSum;
		System.out.printf("%.2f",Sum);
		input.close();
	}
	
	

}

Python :

# coding=utf-8
def getint():
    return [int(i) for i in input().split()]

a,b,c=getint()
ans=0
for i in range(1,a+1):
    ans+=i
for i in range(1,b+1):
    ans+=i*i
for i in range(1,c+1):
    ans+=1/i
print("{:.2f}".format(ans))