import java.util.Scanner;

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

}
}

