#include <stdio.h>

int main(void) {
int a,b,c;
int start,end;
int count=0,i;
scanf("%d %d %d",&a,&b,&c);
if(a<b){
	start=a;
	end=b;
}
else{
	end=a;
	start=b;
}
for(i=start;i<=end;i++){
	if(c%i==0){
		count++;
	}
}
printf("%d",count);
	return 0;
}