#include<iostream>
using namespace std;
int M;
int f(long N)
{
	int ret=0;
	int fac=1;
	int val=1;
	for(int n=1;n<=N&&n<M;n++)
	{
		fac=(long)fac*n%M;
		val=(long)val*fac%M;
		ret=(ret+val)%M;
	}
	return ret;
}
int main()
{
	long L,R;
	cin>>L>>R>>M;
	cout<<(f(R)-f(L-1)+M)%M<<endl;
}