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#include<cstdio>
using namespace std;

#define REP(a,n) for(int a=0;a<n;++a)
#define REP1(a,n) for(int a=1;a<=n;++a)
#define P(a) cout<<#a<<": "<<(a)<<endl;
#define LL long long int

int main(){
    LL k,a,b;
    scanf("%lld%lld%lld",&k,&a,&b);
    LL ans=0;

    LL f=81*18;
    for(LL n=0;n<=f;n++){
        if(n*k<a)continue;
        if(n*k>b)break;
        LL sum=0;
        LL nk=n*k;
        while(nk>0){
            sum+=(nk%10)*(nk%10);
            nk/=10;
        }
        if(sum==n)
            ++ans;
    }
    printf("%lld",ans);
    return 0;
}