#include <stdio.h>
int main(void) {
    int a, b, c, i, divisor;
    divisor = 0;
    scanf(""%d %d %d", &a, &b, &c);
    for (i = a + 1; i < b; i ++) {
        if (c % i == 0) divisor ++;
    }
    printf("%d\n", divisor);
    return 0;
}