fn main() {
    let mut xx = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), &mut xx).ok();
    let xx: Vec<&str> = xx.split_whitespace().collect();

    let m: usize = xx[1].parse().unwrap();
    let k: u64 = xx[2].parse().unwrap();
    let mut bb: Vec<u64> = xx[4..4 + m].iter().map(|&s| s.parse().unwrap()).collect();
    let mut aa: Vec<u64> = xx[4 + m..].iter().map(|&s| s.parse().unwrap()).collect();

    let op = match xx.get(3) {
        Some(&"+") => |a, b| a + b,
        Some(&"*") => |a, b| a * b,
        _ => unreachable!(),
    };

    aa.sort_unstable();
    bb.sort_unstable();
    aa.reverse();
    bb.reverse();

    let mut answer = 0;
    let mut left = 0;
    let mut right = bb.len();
    for &a in &aa {
        while left < right {
            let center = (left + right) / 2;
            if op(a, bb[center]) >= k {
                left = center + 1;
            } else {
                right = center;
            }
        }
        answer += left;
        left = 0;
    }

    println!("{answer}");
}