#include <stdio.h>
#include <assert.h>

int main() {
  int N;
  assert(scanf("%d", &N) == 1);
  assert(getchar() == '\n');
  assert(3 <= N && N <= 200);
  for (int i = 0; i < N; i++) {
    int l, r;
    assert(scanf("%d", &l) == 1);
    assert(getchar() == ' ');
    assert(scanf("%d", &r) == 1);
    assert(getchar() == '\n');
    assert(1 <= l && l < r && r <= 1000000000);
  }
  assert(getchar() == EOF);
  return 0;
}