int main(){
int a[100];
int i,n,squarsum=0;
scanf("%d",&n);
for(i=0;i<n;i++){
	a[i]=i+1;
	if(a[i]%7==0||a[i]/10==7||a[i]-a[i]/10*10==7)
		continue;
	squarsum+=a[i]*a[i];
}
	printf("%d",squarsum);
return 0;
}

