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#include <iostream>
#include <vector>

using namespace std;

int countAnalogousArrays(vector<int> consecutiveDifference, int lowerBound, int upperBound) {
    int n = consecutiveDifference.size();
    int count = 0;

    // Loop through all possible starting values within the given range
    for (int startValue = lowerBound; startValue < upperBound; ++startValue) {
        bool isValid = true;
        int currentValue = startValue;

        // Check if each value in the array is within bounds
        for (int i = 0; i < n; ++i) {
            currentValue -= consecutiveDifference[i];

            // If the calculated value is out of bounds, break the loop
            if (currentValue < lowerBound || currentValue >= upperBound) {
                isValid = false;
                break;
            }
        }

        // If the array is valid, increment the count
        if (isValid) {
            ++count;
        }
    }

    return count;
}

int main() {
    int n;
    cin >> n;

    vector<int> consecutiveDifference(n);
    for (int i = 0; i < n; ++i) {
        cin >> consecutiveDifference[i];
    }

    int lowerBound, upperBound;
    cin >> lowerBound >> upperBound;

    int result = countAnalogousArrays(consecutiveDifference, lowerBound, upperBound);
    cout << result << endl;

    return 0;
}