#include <bits/stdc++.h>   using namespace std;   long long gcd(long long a, long long b) { return b == 0 ? a : gcd(b, a % b); }   long long lcm(long long a, long long b) { return a * (b / gcd(a, b)); }   long long Max(long long a, long long b) { return a > b ? a : b; }   long long Min(long long a, long long b) { return a < b ? a : b; }   long long power(long long x, long long y, long long p) {     long long res = 1;     x = x % p;     while (y > 0) {       if (y & 1) res = ((res % p) * (x % p)) % p;       y = y >> 1;       x = ((x % p) * (x % p)) % p;     }     return res;   }   bool isprime(long long n) {     if (n == 2) return true;     if (n % 2 == 0) return false;     for (long long i = 3; i * i <= n; i += 2) {       if (n % i == 0) return false;     }     return true;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     long long n, lo = 0, hi = 1000000007LL, ans = -1000000007LL, flag = 0;     cin >> n;     vector<pair<long long, long long> > arr(n);     vector<pair<long long, long long> > poss(n + 1);     for (long long i = 0; i < n; i++) {       cin >> arr[i].first >> arr[i].second;       if (arr[i].second == 2) flag = 1;     }     if (arr[0].second == 1) {       poss[0].first = 1900;       poss[0].second = 1000000007LL;     } else {       poss[0].first = -1000000007LL;       poss[0].second = 1899;     }     for (long long i = 1; i < n; i++) {       poss[i].first = poss[i - 1].first + arr[i - 1].first;       poss[i].second = poss[i - 1].second + arr[i - 1].first;       if (poss[i].first > poss[i].second) {         cout <<  Impossible ;         return 0;       }       if (arr[i].second == 1) {         poss[i].first = Max(poss[i].first, 1900);         if (poss[i].second < poss[i].first) {           cout <<  Impossible ;           return 0;         }       } else {         poss[i].second = Min(poss[i].second, 1899);         if (poss[i].second < poss[i].first) {           cout <<  Impossible ;           return 0;         }       }     }     poss[n].first = poss[n - 1].first + arr[n - 1].first;     poss[n].second = poss[n - 1].second + arr[n - 1].first;     if (poss[n].first > poss[n].second) {       cout <<  Impossible ;       return 0;     } else if (flag == 0) {       cout <<  Infinity ;     } else {       cout << poss[n].second;     }     return 0;   }   