#include <iostream>
#include <sstream>
#include <string>

using namespace std;

int numStations = 0; //# of gas stations
const int MAXSTATIONS = 100;
double distances[MAXSTATIONS] = {0}; //first entry is not gas station
double prices[MAXSTATIONS] = {100}; //it is starting position
double range; //range of the car, distance it can go with full tank of gas

//find the gas station with the cheapest gas, within the specified range
int minGasPriceIndex(int startIndex, int stopIndex) {
    double minPriceSoFar = prices[startIndex];
    double minIndexSoFar = startIndex;
    for(int i=startIndex+1; i<=stopIndex; i++)
        if (prices[i] < minPriceSoFar) {
            minPriceSoFar = prices[i];
            minIndexSoFar = i;
        }
    return minIndexSoFar;
}

//find the last gas station before reaching distance.
int findLastIndex(double distance) {
    int index = numStations;
    while (distances[index] >= distance)
        index--;
    return index;
}

//how many gas stops we need to make to reach from distances[currentIndex] to destDistance?
int gasStops(int currentIndex, double destDistance) {



}

//extract the entries from line and put the data into specified array.
//returns # of entries stored in array
int extract(string line, double array[]) {
    istringstream istr(line);
    int lastIndex = 1;  //index 0 is used by starting position
    while (istr >> array[lastIndex])
        lastIndex++;
    lastIndex--;
    return lastIndex;
}

int main() {
    string line;
    double distToDestination;

    getline(cin, line); //distances
    numStations = extract(line, distances);
    getline(cin, line); //prices
    extract(line, prices);

    cin >> range >> distToDestination;

    cout << gasStops(0, distToDestination);
}