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#include <cstdio>
long long MAX = 1000000000;
int wyn;
long long k, a, b, K;
int sum(long long p) {
    int ret = 0;
    while (p != 0) {
        ret += ((p%10)*(p%10));
        p /= 10;
    }
   // printf("%d ", ret);
    return ret;
}
int main() {
    MAX *= MAX;
    scanf("%lld%lld%lld", &k, &a, &b);
    K = k;
    for (int i = 1; i < 2000; i++) {
      //      printf("%d ", K);
        if (sum(K) == i and K >= a)
            wyn++;
        K += k;
        if (K > b)
            break;
    }
    printf("%d", wyn);
    return 0;
}