#include<bits/stdc++.h>
#define rep(i,n,m) for(int i = (n); i <(m); i++)
#define rrep(i,n,m) for(int i = (n) - 1; i >=(m); i--)
using namespace std;
using ll = long long;
const ll MOD = 1000000007;
// const int MAX_N = 3003;

int main()
{
    ll n, m, k;
    cin >> n >> m >> k;
    int elev[n][2];
    rep(i, 0, m)
    {
        int l, r;
        cin >> elev[i][0] >> elev[i][1];
        --elev[i][0];
    }

    vector<ll> cur(n, 0);
    cur[0] = 1;
    rep(i, 0, k)
    {
        vector<ll> csum(n+1, 0);
        rep(j, 0, n) csum[j+1] += cur[j] + csum[j];
        vector<ll> next(n+1, 0);

        rep(j, 0, m)
        {
            ll add = csum[elev[j][1]] - csum[elev[j][0]];
            next[elev[j][0]] += add;
            next[elev[j][1]] -= add;
            next[elev[j][0]] %= MOD;
            next[elev[j][1]] %= MOD;
            
            // cout << i << ' ' << j << ' ' << add << ' ' << next[0] <<  ' ' << elev[j][1] << endl;

        }
        rep(j, 0, n) next[j+1] += next[j], next[j+1] %= MOD;
        swap(next, cur);
    }
    if (cur[n-1] < 0 ) cur[n-1] += MOD, cur[n-1] %= MOD;
    cout << cur[n-1] << endl;

    return 0;
}