#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream f("atac.in");
ofstream g("atac.out");
#define MAXN 32010
#define MAXLOG 18
#define INF 1000000000
vector <pair<int,int> > G[MAXN];
int viz[MAXN],n,m,p,niv[MAXN],x,y,str[MAXLOG][MAXN],dp[MAXLOG][MAXN],a,b,c,d,z;
void dfs(int nod)
{
    viz[nod]=1;
    for(auto it:G[nod])
    {
        if(!viz[it.first])
        {
            niv[it.first]=niv[nod]+1;
            str[0][it.first]=nod;
            dp[0][it.first]=it.second;
            dfs(it.first);
        }
    }
}
int get_min(int x,int y)
{
    if(niv[x]<niv[y])
    swap(x,y);
    int minim=INF;
    int dif=niv[x]-niv[y];
    for(int k=MAXLOG-1;k>=0;k--)
        if(niv[str[k][x]]>=niv[y])
        {
            minim=min(minim,dp[k][x]);
            x=str[k][x];
        }
    if(x==y)
        return minim;
    for(int k=MAXLOG-1;k>=0;k--)
    {
        if(str[k][x]!=str[k][y])
        {
            minim=min(minim,dp[k][x]);
            x=str[k][x];
            minim=min(minim,dp[k][y]);
            y=str[k][y];
        }
    }
    return min(minim,min(dp[0][x],dp[0][y]));
}
int main()
{
    f>>n>>m>>p;
    for(int i=2;i<=n;i++)
    {
        f>>x>>y;
        G[i].push_back(make_pair(x,y));
        G[x].push_back(make_pair(i,y));

    }
    niv[1]=1;
    dfs(1);
    for(int k=1;k<MAXLOG;k++)
    {
        for(int i=1;i<=n;i++)
        {
            str[k][i]=str[k-1][str[k-1][i]];
            dp[k][i]=min(dp[k-1][i],dp[k-1][str[k-1][i]]);
        }
    }
    f>>x>>y>>a>>b>>c>>d;
    for(int i=1;i<=m;i++)
    {
        z=get_min(x,y);
        if(m-i+1<=p)
            g<<z<<'\n';
        x=(x*a+b*y)%n+1;
        y=(y*c+z*d)%n+1;
    }
    return 0;
}