fn main() {
    let ref mut buf = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), buf).ok();
    let mut iter = buf.split_whitespace();

    macro_rules! scan {
        ([$t:tt; $n:expr]) => ((0..$n).map(|_| scan!($t)).collect::<Vec<_>>());
        (($($t:tt),*)) => (($(scan!($t)),*));
        (Usize1) => (scan!(usize) - 1);
        (Bytes) => (scan!(String).into_bytes());
        ($t:ty) => (iter.next().unwrap().parse::<$t>().unwrap());
    }

    let (a, b, c, d, e) = scan!((u64, u64, u64, u64, u64));

    let v = vec![
        vec![1; a as usize],
        vec![0; b as usize],
        vec![1; c as usize],
        vec![0; d as usize],
    ];

    let k = (a + b) * (c + d);

    let mut r1 = v[0].iter().chain(v[1].iter()).cycle();
    let mut r2 = v[2].iter().chain(v[3].iter()).cycle();
    let mut x = 0;
    for _ in 0..k {
        x += (r1.next().unwrap() & r2.next().unwrap()) as u64;
    }

    let mut r1 = v[0].iter().chain(v[1].iter()).cycle();
    let mut r2 = v[2].iter().chain(v[3].iter()).cycle();
    let mut y = 0;
    for _ in 0..e % k {
        y += (r1.next().unwrap() & r2.next().unwrap()) as u64;
    }

    let ans = e / k * x + y;
    println!("{}", ans);
}