#include<bits/stdc++.h>
using namespace std;
signed main() {
int n; cin >> n;
vector<int> l(n), r(n);
for(int i=0; i<n; i++) cin >> l[i] >> r[i];
vector<int> dp(n, 1);
for(int i=1; i<n; i++) {
if(i > 2) dp[i]=max(dp[i], dp[i-3]+1);
if(i > 1) {
if(r[i-2] < 2 && l[i] < 2) dp[i]=max(dp[i], dp[i-2]+1);
}
if(r[i-1] < 1 && l[i] < 1) dp[i]=max(dp[i], dp[i-1]+1);
}
int ans=0;
for(int i=0; i<n; i++) ans=max(ans, dp[i]);
cout << ans;
return 0;
}
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