n=int(input().split()[0])
c=[0]*1001
for _ in[0]*n:c[int(input())]+=1
print(n-sum(x%2for x in c)//2)// Online C++ compiler to run C++ program online
#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int main() {
int t, k;
cin >> t >> k;
vector<int> arr(t);
for(auto &it:arr) {cin >> it;}
vector<int> f(k+1, 0);
for(auto it:arr) {
f[it]++;
}
int count = 0, rem=0;
for(int i = 1; i<=k; ++i){
count += (f[i]/2);
rem += (f[i]%2);
}
cout << (count*2) +((t+1)/2)-count;
return 0;
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