#include <unordered_map>
using namespace std;

int read() {
  int x = 0, w = 1;
  char ch = 0;
  while (ch < '0' || ch > '9') {
    if (ch == '-')
      w = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9') {
    x = x * 10 + (ch - '0');
    ch = getchar();
  }
  return x * w;
}

int main() {
  int n = read();
  unordered_map<int, int> u;
  for (int i = 0; i < n; i++) {
    int val = read();
    u[val]++;
  }
  for (const auto &[key, value] : u) {
    if (value >= n / 2) {
      printf("%d\n", key);
      return 0;
    }
  }
  printf("No\n");
}