#include<bits/stdc++.h>

int main(){
    int n, k; std::cin >> n >> k;
    long long sum = 0;
    std::vector<int> a(n);
    for (auto &x : a){
        std::cin >> x;
        sum += x;
        if (x > k){
            x = -(x % 2);
        }
    }
    std::ranges::sort(a, std::greater<int>{});
    long long diff = 0;
    for (int p = 1; auto &x : a){
        diff += p * x;
        p *= -1;
    }
    std::cout << (sum + diff) / 2 << std::endl;
}