#include <bits/stdc++.h>
#define sz(x) ((int)(x).size())
#define all(x) begin(x), end(x)
#ifdef memset0
#define log(...) fprintf(stderr, __VA_ARGS__)
#else
#define endl '\n'
#define log(...) (void(0))
#endif
using namespace std;
using ll = long long;
using lf = long double;
using ull = unsigned long long;

const int N = 109;
int n, m, l[N], r[N], bis;
string s;

int main() {
#ifdef memset0
  freopen("D.in", "r", stdin);
#endif
  cin.tie(0)->sync_with_stdio(0);
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> s;
    m = s.length() - 2;
    int x = 0;
    for (int c : s)
      if (c != '.') {
        x = x * 10 + c - '0';
      }
    x *= 10;
    l[i] = x - 5;
    r[i] = x + 5;
  }
  for (int i = 1; i <= n; i++) {
    log("> %d %d\n", l[i], r[i]);
  }
  bis = 1;
  for (int i = 0; i <= m; i++) {
    bis *= 10;
  }
  log("> %d\n", bis);

  for (int d = 1; d <= bis; d++) {
    long long sl = 0, sr = 0;
    for (int i = 1; i <= n; i++) {
      sl += ((long long)l[i] * d + bis - 1) / bis;
      sr += (long long)r[i] * d / bis;
    }
    if (sl <= d && d <= sr) {
      cout << d << endl;
      return 0;
    }
  }
}