import java.util.*;
public class Main {
    public static void main(String[]args){
    	Scanner sc = new Scanner(System.in);
    	int reg =0;
    	int a = sc.nextInt();
    	int b = sc.nextInt();
    	int c = sc.nextInt();
    	for(int i=a;i<b+1;i++){
    		if(c%i==0){
    			reg++;
    		}
    	}
    	System.out.println(reg);
    }
}

