#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 1000000000000000001



int main(){
	
	int n;
	cin>>n;
	
	string s,t;
	cin>>s>>t;
	
	int c = 0;
	rep(i,s.size()){
		c ^= s[i]-'0';
		c ^= t[i]-'0';
	}
	if(c%2==1)reverse(s.begin(),s.end());
	
	int ans = 0;
	rep(i,n){
		if(s[i]!=t[i])ans++;
	}
	
	cout<<ans<<endl;
	
	return 0;
}