#include <stdio.h>

int main(void) {
	int a,b,c;
    int sum=0;


scanf("%d %d %d",&a,&b,&c);
	if (a>b){
        int d=a;
        a=b;
        b=d;}
for (int i = a; i<=b; i++) {
        if (c%i==0) {sum++;}
}
printf("%d",sum);
return 0;
}