//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("Ofast")

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

#define pb push_back
#define pii pair<int, int>
#define mp make_pair
#define loop(i, n) for(int i = 0; i < (int)n; ++i)
#define loop1(i, n) for(int i = 1; i <= (int)n; ++i)
#define F first
#define S second
#define sorted(a) sort(a.begin(), a.end())

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n;
    cin >> n;
    vector <pair <int, ll>> a(n);
    for (int i = 0; i < n; ++i) {
        int x, y;
        cin >> x >> y;
        a[i] = mp(x, y);
    }
    ll left = 0, right = 2e9 + 2;
    while (right - left > 1) {
        ll mid = left + (right - left) / 2;
        for (int i = 0; i < n; ++i) {
            if (a[i].F == 1) {
                mid *= a[i].S;
            }
            else if (a[i].F == 2) {
                mid += a[i].S;
            }
            else {
                mid -= a[i].S;
            }
            if (mid > 1e9) break;
        }
        if (mid <= 0) {
            left = left + (right - left) / 2;
        }
        else {
            right = left + (right - left) / 2;
        }
    }
    cout << right;
    return 0;
}