#include<bits/stdc++.h>
using namespace std;
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define rep(i,n) for (int i=0;i<(long long)(n);i++)
#define all(v) v.begin(),v.end()
using ll=long long;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll,ll>;
const ll INF=(1ll<<60);
template<class T> void chmin(T &a,T b){
    if(a>b){
        a=b;
    }
}
template<class T> void chmax(T &a,T b){
    if(a<b){
        a=b;
    }
}
int main(){
    ll l,r,m;
    cin >> l >> r >> m;
    vector<ll> f(m);
    f[0]=1;
    f[1]=1;
    rep(i,m){
        if(i<1) continue;
        f[i+1]=f[i]*(i+1)%m;
    }
    vector<ll> ff(m+1,1);
    rep(i,m) ff[i+1]=ff[i]*f[i]%m;
    ll ans=0;
    for(ll i=l;i<=min(m-2,r);i++){
        ans+=ff[i+1];
        ans%=m;
    }
    cout << ans << endl;
}