#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <map>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <stack>
#include <algorithm>
#include <array>
#include <unordered_set>
#include <unordered_map>
#include <string>
using namespace std;

bool rcmp(int a, int b) { return a>b; }
typedef long long LL;



int main() {
    int n, i, m;
    LL r, l, b, x, s;
    scanf("%lld %lld %d", &l, &r, &m);
    if (l>=m) printf("0\n");
    else {
        b=1; x=1; s=0;
        for (i=1; i<l; i++) {
           b*=i;  b%=m;
           x*=b; x%=m;
           // s+=b; s%=m;
        }
        for (; i<=r&&i<m; i++) {
            b*=i; b%=m;
            x*=b; x%=m;
            s+=x; s%=m;
        }
        printf("%lld\n", s);
    }
    return 0;
}