#include <stdio.h>

int main()
{
    int n, cnt = 0, i, d, dd, f;
    printf("n = ");
    scanf("%d", &n);
    if (n < 1) {
        f = -1;
    } else {
        f = 1;
    }
    for (i = 1; i != n + f; i += f) {
        d = i > 0 ? i : -i;
        while (d) {
            dd = d % 10;
            if (dd == 3 || dd == 5) {
                dd = -1;
                break;
            }
            d /= 10;
        }
        if (dd >= 0) {
            cnt++;
        }
    }
    printf("%d\n", cnt);
    return 0;
}