Esteira

#include <bits/stdc++.h>
using namespace std;

int n, a, d;

int main() {
  cin.tie(0)->sync_with_stdio(0);
  cin >> n;
  bool waiting = false;
  int last = 0, curr = -1;
  for (int i = 0; i < n; ++i) {
    cin >> a >> d;
    if (a > last and waiting) {
      last += 10;
      curr ^= 1;
      waiting = false;
    }
    if (a > last) {
      last = a + 10;
      curr = d;
    } else if (a < last) {
      if (curr != d) {
        waiting = true;
      } else {
        last = a + 10;
      }
    }
  }
  if (waiting) last += 10;
  cout << last << '\n';
}
/*
6
5 0
9 0
10 1
11 1
12 0
15 0
R = 35

7
5 0
9 0
10 1
11 1
12 0
15 0
24 1
R = 35

7
5 0
9 0
10 1
11 1
12 0
15 0
26 1
R = 36

4
5 0
7 1
14 0
15 0
R = 35

4
5 0
8 0
10 1
13 0
R = 33

*/