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 n = 0;
		for(int i = a;i <= b;i++){
			if(c%i==0) n++;
		}
		System.out.println(n);
	}
}

