//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

constexpr LL mod = 1e9 + 7;

struct LazySegmentTree {
private:
    LL n;
    vector<LL> node, lazy;

public:
    LazySegmentTree(vector<LL> v) {
        LL sz = (LL) v.size();
        n = 1;
        while (n < sz) n *= 2;
        node.resize(2 * n - 1);
        lazy.resize(2 * n - 1, 0);

        for (LL i = 0; i < sz; i++) node[i + n - 1] = v[i];
        for (LL i = n - 2; i >= 0; i--) node[i] = (node[i * 2 + 1] + node[i * 2 + 2]) % mod;
    }

    void eval(LL k, LL l, LL r) {
        if (lazy[k] != 0) {
            node[k] += lazy[k];
            node[k] %= mod;
            if (r - l > 1) {
                lazy[2 * k + 1] += lazy[k] / 2;
                lazy[2 * k + 2] += lazy[k] / 2;
            }
            lazy[k] = 0;
        }
    }

    void add(LL a, LL b, LL x, LL k = 0, LL l = 0, LL r = -1) {
        if (r < 0) r = n;
        eval(k, l, r);
        if (b <= l || r <= a) return;
        if (a <= l && r <= b) {
            lazy[k] += (r - l) * x;
            eval(k, l, r);
        } else {
            add(a, b, x, 2 * k + 1, l, (l + r) / 2);
            add(a, b, x, 2 * k + 2, (l + r) / 2, r);
            node[k] = node[2 * k + 1] + node[2 * k + 2];
            node[k] %= mod;
        }
    }

    LL getsum(LL a, LL b, LL k = 0, LL l = 0, LL r = -1) {
        if (r < 0) r = n;
        eval(k, l, r);
        if (b <= l || r <= a) return 0;
        if (a <= l && r <= b) return node[k] % mod;
        LL vl = getsum(a, b, 2 * k + 1, l, (l + r) / 2);
        LL vr = getsum(a, b, 2 * k + 2, (l + r) / 2, r);
        return (vl + vr) % mod;
    }
};

int main() {

    int N, M, K;
    cin >> N >> M >> K;

    vector<int> L(M), R(M);
    for (int i = 0; i < M; i++) {
        cin >> L[i] >> R[i];
        L[i]--, R[i]--;
    }

    vector<LazySegmentTree> dp(K + 1, LazySegmentTree(vector<LL>(K, 0)));
    dp[0].add(0, 1, 1);

    //
    for (int i = 0; i < K; i++) {
        for (int j = 0; j < M; j++) {
            int l = L[j];
            int r = R[j];
            dp[i + 1].add(l, r + 1, dp[i].getsum(l, r + 1));
        }
    }

    cout << dp[K].getsum(N - 1, N);

    return 0;
}