#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];
int ans=0;
for(int i=0; i<n; i+=r[0]+1) ans++;
cout << ans;
return 0;
}
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