import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class Main {

    public static void main(String[] args) throws IOException {

        int num = 0;
        ArrayList<Integer> yaku = new ArrayList<>();

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] line = br.readLine().split(" ");
        int a = Integer.parseInt(line[0]);
        int b = Integer.parseInt(line[1]);
        int c = Integer.parseInt(line[2]);

        for (int x = 1; x <= c; x++) {
            if (c % x == 0) {
                yaku.add(x);
            } else {

            }
        }


            do {
                if (yaku.contains(a)) {
                    num++;
                }

                a++;
                
                

            } while (a-1 != b);
        

        System.out.println(num);

    }

}
/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