#![allow(unused_imports)] use std::cmp::*; use std::collections::*; use std::io::Write; use std::ops::Bound::*; #[allow(unused_macros)] macro_rules! debug { ($($e:expr),*) => { #[cfg(debug_assertions)] $({ let (e, mut err) = (stringify!($e), std::io::stderr()); writeln!(err, "{} = {:?}", e, $e).unwrap() })* }; } fn main() { let v = read_vec::(); let (n, m, p) = (v[0] as usize, v[1], v[2]); let a = read_vec::(); let amax = *a.iter().max().unwrap(); let mut aa = vec![]; let mut counts = vec![]; for mut num in a { let mut count = 1usize; while num % p == 0 { num /= p; count += 1usize; } aa.push(num); counts.push(count); } // debug!(aa); let aa_max = *aa.iter().max().unwrap(); if aa_max == 1 && amax <= m { println!("-1"); return; } if m == 1 { println!("1"); return; } let mut dp = vec![0i64; 1000]; dp[0] = 1; for i in 0..dp.len() - 1 { if dp[i] > m { break; } for j in 0..n { if i + counts[j] >= dp.len() { continue; } dp[i + counts[j]] = max(dp[i + counts[j]], dp[i] * aa[j]); } } for i in 0..dp.len() { if dp[i] * amax > m { println!("{}", i + 1); return; } } } fn read() -> T { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); s.trim().parse().ok().unwrap() } fn read_vec() -> Vec { read::() .split_whitespace() .map(|e| e.parse().ok().unwrap()) .collect() }