C :

#include <stdio.h>

int f(int a,int b)
{
    if ( !(a%b) )   return b;
    return f(b,a%b);
}

int main(void)
{
    int a,b,c;
    int res;

    scanf("%d %d %d",&a,&b,&c);
    res = a * b / f(a,b);
    res = res * c / f(res,c);
    printf("%d\n",res);
    return 0;
}

C++ :

#include <iostream>
using namespace std;
int main()
{
	long a;
	long b;
	long c;
	long max;
	int i=2;
	cin >>a >>b>>c;
	if(a>b&&a>c)
		max=a;
	if(b>a&&b>c)
		max=b;
	if(c>a&&c>b)
		max=c;
	while(max%a!=0||max%b!=0||max%c!=0)
	{
		max=max++;
		
	}
	cout <<max<<endl;
	return 0;
}

Java :

import java.util.Scanner;
/**
 *
 * @author zhenghan33
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner cin=new Scanner(System.in);
        int[]a=new int[3];
        a[0]=cin.nextInt();
        a[1]=cin.nextInt();
        a[2]=cin.nextInt();
        java.util.Arrays.sort(a);
        int n=a[2];
        while(n%a[0]!=0||n%a[1]!=0||n%a[2]!=0)
            n++;
        System.out.println(n);
    }

}