#include <stdio.h>

int main(void) {
	int a,b,c;
	int count=0;
	
	scanf("%d %d %d",&a,&b,&c);

    do{
       	if(c%a==0)
       	{
      	count++;
       	}
       	a=a+1;
    }while(a<=b);
    
    printf("%d個",count);
    
	return 0;
}