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#include <stdio.h>
#include <stdlib.h>

#define u64 unsigned long long int

u64 f(u64 n) {
        u64 r;
        r = 0;
        while (n > 9) {
                r += (n%10) * (n%10);
                n /= 10;
        }
        r += n*n;
        return r;
}

int main() {
        u64 a,b,k,i,r;

        scanf("%Lu %Lu %Lu\n", &k, &a, &b);
        i = a - a%k;
        if (i<a) i+=k;
        r = 0;
        while (i<=b) {
                if ( f(i)*k == i )
                        r++;

                i += k;
        }

        printf("%Lu\n", r);

        return 0;
}