#include <stdio.h>

int main(void) {
	int a,b,c;
	int i;
	int sum=0;
	scanf("%d",&a);
	scanf("%d",&b);
	scanf("%d",&c);
	if(a>b){
		int temp=a;
		a=b;
		b=temp;
	}
	i=a;
	while(i<=b){
		if(c%i==0){
			sum++;
		}
		i++;
	}
	printf("%d\n",sum);
	return 0;
}