#include <bits/stdc++.h>
using namespace std;

#define REP(i, n) for(ll (i) = 0; (i) < (n); (i)++)
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))

typedef long long ll;

ll gcm(ll a, ll b){
	ll c;
	if(a < b){
		c = a; a = b; b = c;
	}
	while(b){
		c = a%b; a = b; b = c;
	}

	return a;
}

int main(void){
	ll t, a, b;
	cin >> t >> a >> b;

	ll lcm = a*b/gcm(a, b);
	ll ans = t/a+t/b-t/lcm+1;

	if(t%a == 0) ans--;
	if(t%b == 0) ans--;
	if(t%lcm == 0) ans++;

	cout << ans << endl;

	return 0;
}