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