This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
int arr[3334] = {};
signed main () {
int n;
cin >> n;
while (n--) {
int x, y;
cin >> x >> y;
x /= 2;
arr[x] = max(arr[x], y);
}
int ans = arr[3333];
for (int i = 3332; i >= 1; i--) {
arr[i] = max(arr[i], arr[i + 1]);
ans += arr[i];
}
ans *= 2;
cout << ans << '\n';
}
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