const INF: usize = 1usize << 60;

fn main() {
    let mut v0123 = String::new();
    std::io::stdin().read_line(&mut v0123).ok();
    let v: Vec<usize> = v0123.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let mut result = INF;
    for i in 1..=30 {
        for j in i+1..=30 {
            for k in j+1..=30 {
                let mut cnt = 0usize;
                let mut flg = true;
                let selector = [i,j,k];
                for l in 0..4 {
                    let mut dp = vec![vec![INF; 1+v[l]]; 4];
                    dp[0][0] = 0;
                    for ii in 0..3 {
                        for jj in 0..=v[l] {
                            if dp[ii][jj] == INF { continue; }
                            for kk in 0..=(v[l]-jj)/selector[ii] {
                                dp[ii+1][jj+kk*selector[ii]] = dp[ii+1][jj+kk*selector[ii]].min(dp[ii][jj]+kk);
                            }
                        }
                    }
                    if dp[3][v[l]] == INF {
                        flg = false;
                        break;
                    } else {
                        cnt += dp[3][v[l]];
                    }
                }
                if flg {
                    result = result.min(cnt);
                }
            }
        }
    }
    println!("{}", result);
}