noname50

#include<bits/stdc++.h>
#include<time.h>

using namespace std;

#define ll long long








        /* ----------------- ~~~~~~~ ----------------- */

    ll l, r, m, res;

/* ----------------- ~~~~~~~ ----------------- */

int main(){

    //freopen("INPUT.inp", "r", stdin);
    //freopen("OUTPUT.out", "w", stdout);
    ios_base::sync_with_stdio(0); cin.tie(0);

        /* ----------------- main func ----------------- */

    srand(time(0));
    cin >> l >> r >> m;
    res = m;
    while(clock() <= 0.95*CLOCKS_PER_SEC){
        int x = rand()%(r - l + 1) + l;
        if(x != l)
            res = min(res, x*(rand()%(x - l) + l)%m);
        if(x != r)
            res = min(res, x*(rand()%(r - x) + x + 1)%m);
    }
    cout << res;

/* ----------------- ~~~~~~~~~ ----------------- */

}