#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <cmath>

static const int MOD = 1000000007;
using ll = long long;
using u32 = unsigned;
using u64 = unsigned long long;
using namespace std;

template<class T> constexpr T INF = ::numeric_limits<T>::max()/32*15+208;

template<u32 M = 1000000007>
struct modint{
    u32 val;
    modint(): val(0){}
    template<typename T>
    modint(T t){t %= (T)M; if(t < 0) t += (T)M; val = t;}

    modint pow(ll k) const {
        modint res(1), x(val);
        while(k){
            if(k&1) res *= x;
            x *= x;
            k >>= 1;
        }
        return res;
    }
    template<typename T>
    modint& operator=(T t){t %= (T)M; if(t < 0) t += (T)M; val = t; return *this;}
    modint inv() const {return pow(M-2);}
    modint& operator+=(modint a){val += a.val; if(val >= M) val -= M; return *this;}
    modint& operator-=(modint a){if(val < a.val) val += M-a.val; else val -= a.val; return *this;}
    modint& operator*=(modint a){val = (u64)val*a.val%M; return *this;}
    modint& operator/=(modint a){return (*this) *= a.inv();}
    modint operator+(modint a) const {return modint(val) +=a;}
    modint operator-(modint a) const {return modint(val) -=a;}
    modint operator*(modint a) const {return modint(val) *=a;}
    modint operator/(modint a) const {return modint(val) /=a;}
    modint operator-(){return modint(M-val);}
    bool operator==(const modint a) const {return val == a.val;}
    bool operator!=(const modint a) const {return val != a.val;}
    bool operator<(const modint a) const {return val < a.val;}
};

class Factorial {
    using mint = modint<MOD>;
    vector<mint> facts, factinv;

public:
    explicit Factorial(int n) : facts(static_cast<u32>(n+1)), factinv(static_cast<u32>(n+1)) {
        facts[0] = 1;
        for (int i = 1; i < n+1; ++i) facts[i] = facts[i-1]*mint(i);
        factinv[n] = facts[n].inv();
        for (int i = n-1; i >= 0; --i) factinv[i] = factinv[i+1] * mint(i+1);
    }

    mint fact(int k) const {
        if(k >= 0) return facts[k]; else return factinv[-k];
    }

    mint operator[](const int &k) const {
        if(k >= 0) return facts[k]; else return factinv[-k];
    }

    mint C(int p, int q) const {
        if(q < 0 || p < q) return 0;
        return facts[p] * factinv[q] * factinv[p-q];
    }

    mint P(int p, int q) const {
        if(q < 0 || p < q) return 0;
        return facts[p] * factinv[p-q];
    }

    mint H(int p, int q) const {
        if(p < 0 || q < 0) return 0;
        return q == 0 ? 1 : C(p+q-1, q);
    }
};


using mint = modint<MOD>;

template<class T>
class BIT {
    vector<T> bit;
public:
    BIT(int n): bit(vector<T>(n+1, 0)){}

    T sum(int k){
        T ret = 0;
        for (++k; k > 0; k -= (k & -k)) ret += bit[k];
        return ret;
    }

    void add(int k, T x){
        for (++k; k < bit.size(); k  += (k & -k)) bit[k] += x;
    }
};

void solve(int n){
    vector<int> v(n);
    iota(v.begin(),v.end(), 0);
    int m;
    cin >> m;
    for (int i = 0; i < m; ++i) {
        int a, b;
        scanf("%d %d", &a, &b);
        a--; b--;
        swap(v[a], v[b]);
    }
    mint ans = 0;
    Factorial f(n);
    BIT<int> S(n+1);
    for (int i = 0; i < n; ++i) {
        ans += f[n-i-1]*mint(v[i]-S.sum(v[i]));
        S.add(v[i], 1);
    }
    cout << ans.val << "\n";
}
int main() {
    int n;
    while(cin >> n, n){
        solve(n);
    }
    return 0;
}


Measured memory_bytes: 4464