#include <stdio.h>

int main(void)
{
    int a, b, c;
    int n = 0;
    int i;
    int z;

    scanf("%d %d %d", &a, &b, &c);

    if (a > b)
    {
        z = a;
        a = b;
        b = z;
    }

    i = a;

    while (i <= b)
    {
        if (c % i == 0)
        {
            n++;
        }
        i++;
    }

    printf("%d\n", n);

    return 0;
}