#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(a) (a).begin(),(a).end()
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
const int mod = 1000000007;
signed main(){
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int n;
	cin >> n;
	int x = 0;
	for (int i = 0; i < n; i++) {
		int l, r;
		cin >> l >> r;
		x = l;
	}
	if (n%x == 0) {
		cout << n/x << endl;
	}
	else {
		cout << (n/x) + 1 << endl;
	}
	return 0;
}
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