import java.util.Scanner;
public 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 count = 0;
		
		while(a <= b){
			if(c % a == 0){
				count++;
			}
			a++;
		}
		System.out.println(count);
	}
}
