#include <bits/stdc++.h>
#define pb push_back
using namespace std;
const int N=3e5+5;
int n,s,dp[N],p[N],arr[N];
vector<int> g[N];
void dfs(int x) {
dp[x]=arr[x];
for (auto y:g[x]) {
dfs(y); if (dp[y]>0) dp[x]+=dp[y];
}
}
int main() {
cin>>n>>s;
for (int i=1; i<=n; i++) {
cin>>arr[i]>>p[i];
g[p[i]].pb(i);
}
dfs(0);
cout<<s+dp[0]<<endl;
}
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