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#include <stdio.h>

int f(unsigned long long n)
{
    int ss = 0;
    while ( n )
    {
        ss += (n%10)*(n%10);
        n /= 10;
    }
    return ss;
}

int main()
{
    unsigned long long k, a, b;
    scanf("%lld %lld %lld",&k,&a,&b);

    int i, ans = 0;
    unsigned long long n = k;

    for (i = 1; i <= 1500; i++)
    {
        if (n > b) break;

        if (n >= a)
        {
            if ( f(n) == i )
            {
                ++ans;
            }
        }

        n += k;
    }

    printf("%d\n",ans);

    return 0;

}