#include <bits/stdc++.h>
using namespace std;

struct iofast_t {
    iofast_t() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} iofast;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

template <typename T, typename Compare = less<T>>
T &chmin(T &l, T r, Compare &&f = less<T>()) { return l = min(l, r, f); }
template <typename T, typename Compare = less<T>>
T &chmax(T &l, T r, Compare &&f = less<T>()) { return l = max(l, r, f); }

#include <atcoder/modint>
using mint = atcoder::modint1000000007;

int main() {
    int64_t range[2][2][2];
    for (auto &[l, r] : range[0]) cin >> l >> r;
    range[1][0][0] = range[0][0][0] - range[0][1][1];
    range[1][0][1] = range[0][0][1] - range[0][1][0];
    range[1][1][0] = range[0][0][0] + range[0][1][0];
    range[1][1][1] = range[0][0][1] + range[0][1][1];
    int64_t n; cin >> n;

    auto x = n - 1;
    auto m = x / 2;
    auto v = (m + 3) % 4;
    auto sign = 2 * (v / 2) - 1;

    cout << (sign * mint(2).pow(m + 1) * range[x % 2][!(v % 2)][v / 2]).val() << endl;
}