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#include <cstdio>
#include <cstring>
typedef unsigned long long ULL;
ULL a, b, k;

#define MAX_FN 1700

char buf[50];
ULL f(ULL n) {
	ULL res = 0;
	sprintf(buf, "%llu", n);
	int l = strlen(buf);
	//printf("buf: |%s|, len = %d\n",buf,l);
	
	for(int i = 0; i < l; ++i) {
		int v = (buf[i]-'0');
		v *= v;
		res += v;
	}
	return res;
}

int main() {
	scanf("%llu %llu %llu", &k, &a, &b);
	ULL now = k;

	int count = 0;
	while( now <= b && now < k * MAX_FN) {
		if( now >= a && k * f(now) == now ) {
			count++;
			//printf("res: %llu\n\r", now);
		}
		now += k;
	}
	printf("%d\n",count);
}