import java.util.*;

class Main{
	public static void main(String[]args){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int i;
		int x = 0;
		
		for(i=a;i<=b;i++){
			if(c % i==0){
				x++;
			}
		}
		System.out.println(x);
	}
}
