#include<bits/stdc++.h>
#include<iostream>
#include<string.h>
#include<algorithm>
#include<vector>
#include<math.h>
#include<iomanip>
using namespace std;
int main() {
	long long a,b,c,d=1;
    cin >> a >> b >> c ;
    for (long long i=1;i<=(a-1)*b;i++)
    {
		if (i%(b*c)==0)
		{
			d++;
		}
    }
    cout << d ;
    return 0;
}