#include<bits/stdc++.h>
#define ll long long
#define endl "\n"
#define moo ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
void solve()
{
ll n,ans=0,i;
cin>>n;
vector<pair<ll,ll>>v(n);
for(i=0;i<n;i++)
cin>>v[i].first>>v[i].second;
ans=n/(v[0].first+1);
if(n%(v[0].first+1))
ans++;
cout<<ans;
}
//6 2
/*
x . . x . .
*/
int main()
{
moo
ll t=1;
while(t--)
solve();
}
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