This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// author: erray
#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
string a, b;
cin >> n >> a >> b;
assert(count(a.begin(), a.end(), '0') == n);
int ans = 0;
for (int i = 1; i < n; ++i) {
if (b[i] == '1' && b[i - 1] == '0') {
++ans;
}
}
cout << min(ans, 1 + (ans + 1) / 2) << '\n';
}
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