import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		int intA = scan.nextInt();
		int intB = scan.nextInt();
		int intC = scan.nextInt();
		if(intB < intA){
			int intTemp = intA;
			intA = intB;
			intB = intTemp;
		}
		int intCount = 0;
		for(int i = 0; i <= intB - intA; i++){
			if(intC % (intA + i) ==0){
				intCount++;
			}
		}
		System.out.println(intCount);
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz