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 MOD 1000000007
#define FOR(i, s, e) for(int i = s; i < e; i++)
#define REP(i, n) for(int i = 0; i < n; i++)
#define fir first
#define sec second
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<bool> vb;
typedef vector<pii> vpii;
typedef vector<vpii> vvpii;
typedef vector<pll> vpll;
typedef vector<vpll> vvpll;
vll x;
vvi c;
ll dfs(int a) {
	ll sum = x[a];
	int l = c[a].size();
	REP(i, l) {
		sum += dfs(c[a][i]);
	}
	return max(sum, 0ll);
}
	
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, a;
	ll s;
	cin>>n>>s;
	x.resize(n+1);
	c.resize(n+1);
	x[0] = 0ll;
	FOR(i, 1, n+1) {
		cin>>x[i]>>a;
		c[a].push_back(i);
	}
	if(s == 1e18) {
		cout<<dfs(0);
	}
}
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