  #include <iostream>
using namespace std;
	int main(){
		int a,b,c,x,y,n,d;
		n = 0;
		d = 0;
		cin >> a >> b >> c;
		x = a - 1 ;
		a <= b ;
		1 <= a;b;c <= 100000000;
		while ( x  <= b  ){
		if ( x <= b )
		{
			x = x + 1 ;
			y = c / x ;
	????????????}
		if ( 0 == c - ( x * y ) )
			n = n + 1 ;
		else 
			d = d + 1 ;
		}
		cout << n << endl;
	}