#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <tgmath.h>
#include <time.h>
#define ll long long
#define min(a, b) ((a) > (b) ? (b) : (a))
#define max(a, b) ((a) > (b) ? (a) : (b))
#define miin(a, b, c) min((a), min((b), (c)))
#define maax(a, b, c) max((a), max((b), (c)))
int n;
ll sum = 0;

int main()
{
    scanf("%d", &n);
    for (int i = 1; i <= n; i++)
    {
        if (i % 3 * i % 5)
        {
            sum += i;
        }
    }
    printf("%lld\n", sum);
    return 0;
}