#include <bits/stdc++.h>
using namespace std;
//#define int long long
int main(){
int n; cin >> n;
int x = 0;
int l, r;
cin >> l >> r;
x=l;
for(int i=1;i<n;i++){
cin>>l>>r;
}
int ans = n/x;
if (n%x != 0) {
ans++;
}
cout<<ans;
return 0;
}
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