import java.util.*;

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 sum = 0;

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


