#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <algorithm>
#include <set>
#include <map>
#include <bitset>
#include <cmath>
#include <functional>
#include <iomanip>
#define vll vector<ll>
#define vvvl vector<vvl>
#define vvl vector<vector<ll>>
#define VV(a, b, c, d) vector<vector<d>>(a, vector<d>(b, c))
#define VVV(a, b, c, d) vector<vvl>(a, vvl(b, vll (c, d)));
#define re(c, b) for(ll c=0;c<b;c++)
#define all(obj) (obj).begin(), (obj).end()
typedef __int128_t ll;
typedef long double ld;
using namespace std;

ll gcd(ll a, ll b){
  if(b<a) swap(a, b);
  ll r = a % b;
  if(r==0) return b;
  while(r!=0) r = a % b, a = b, b = r;
  return a;
}
ll lcm(ll a, ll b){return (a*b)/gcd(a, b);}
vll extgcd(ll a, ll b) {
  ll x, y;
  for (ll u = y = 1, v = x = 0; a;) {
    ll q = b / a;
    swap(x -= q * u, u);
    swap(y -= q * v, v);
    swap(b -= q * a, a);
  }
  return vll{x, y, b};
}

std::ostream &operator<<(std::ostream &dest, __int128_t value) {
  std::ostream::sentry s(dest);
  if (s) {
    __uint128_t tmp = value < 0 ? -value : value;
    char buffer[128];
    char *d = std::end(buffer);
    do {
      --d;
      *d = "0123456789"[tmp % 10];
      tmp /= 10;
    } while (tmp != 0);
    if (value < 0) {
      --d;
      *d = '-';
    }
    int len = std::end(buffer) - d;
    if (dest.rdbuf()->sputn(d, len) != len) {
      dest.setstate(std::ios_base::badbit);
    }
  }
  return dest;
}
int main() {
  ll a, b, c;
  long long int A, B, C;std::cin >> A >> B >> C;
  a = A, b = B, c = C;
  ll ans = (a-1)/b + (a-1)/c + 1 - (a-1)/lcm(b, c);
  std::cout << ans << '\n';
}