import std.stdio;
import std.algorithm;
import std.string : chomp;
import std.range;
import std.conv;
import std.numeric;

void main(string[] args)
{
    auto lcm(ulong a, ulong b) { return a * b / gcd(a, b); }
    immutable n = readln.chomp.to!int;
    auto input = readln.splitter.map!(to!int).array;
    ulong a = input[0], b = input[1], c = input[2];
    writeln(
        n / a + n / b + n / c
        - n / lcm(a, b)
        - n / lcm(a, c)
        - n / lcm(b, c)
        + n / lcm(lcm(a, b), c)
    );
}