#include <stdio.h>

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