#include <bits/stdc++.h>
using namespace std;
const int N=1e5+1;
int a[N];
int main()
{
	freopen("sakura.in","r",stdin);
	freopen("sakura.out","w",stdout);
	int n,m;
	cin>>n>>m;
	for(int i=1;i<=m;i++)
	{
		int x,y;
		cin>>x>>y;
		a[x]++;
		a[y]++;
	}
	int cnt=0;
	for(int i=1;i<=n;i++)
	{
		if(a[i]%2==1) cnt++;
	}
	cout<<cnt/2;
	return 0;
}