C :

#include<stdio.h> 
int LCM(int n,int m); 
int main() 
{ 
    int a,b; 
    scanf("%d,%d",&a,&b); 
    printf("%d\n",LCM(a,b)); 
    return 0; 
} 
int LCM(int n,int m) 
{ 
    int x; 
    int find=0; 
    for(x=1;!find;x++) 
    { 
        if(x%n==0&&x%m==0) 
        { 
            find=1; 
        } 
    } 
    return  x-1; 
}

C++ :

#include<iostream>
#include<cstdio>
using namespace std;
int gbs(int a,int b)
{
	int r,s=a*b;
	if(a>b)
	{
		r=a%b;
		while(r!=0)
		{
			a=b;
			b=r;
			r=a%b;
		}
		return s/b;
	}
	else
	{
		r=b%a;
		while(r!=0)
		{
			b=a;
			a=r;
			r=b%a;
		}
		return s/a;
	}
}
int main()
{
	int x,y;
	scanf("%d,%d",&x,&y);
	gbs(x,y);
	cout<<gbs(x,y);
	return 0;
}