public static boolean check(long n, int p) {
BigInteger P = BigInteger.TEN.pow(p), Q = BigInteger.TEN.pow(p - 1);
BigInteger N = BigInteger.ONE, tmp = BigInteger.valueOf(2);
while (n > 0) {
if ((n % 2) == 1) {
N = N.multiply(tmp);
N = N.mod(P);
}
tmp = tmp.multiply(tmp);
tmp = tmp.mod(P);
n >>= 1;
}
N = N.divide(Q);
if (N.equals(BigInteger.ONE) || N.equals(BigInteger.valueOf(2))) return true;
else return false;
}
void solve(int caseNum) {
int n = in.nextInt();
BigInteger[] past = new BigInteger[n], d = new BigInteger[n];
for (int i = 0; i < n; i++) past[i] = new BigInteger(in.next());
Arrays.sort(past);
for (int i = 0; i < n; i++) d[i] = past[i].subtract(past[0]);
for (int i = 2; i < n; i++) d[i] = d[i].gcd(d[i - 1]);
BigInteger gcd = d[n - 1], mod = past[0].mod(gcd);
System.out.printf("Case #%d: ", caseNum);
if (mod.equals(BigInteger.ZERO)) System.out.println(0);
else System.out.println(gcd.subtract(mod));
}
public static void process() {
Arrays.sort(bookHeight);
BigInteger sum = BigInteger.valueOf(0L);
BigInteger temp;
int iCount = 0;
for (int i = bookHeight.length - 1; i >= 0; i--) {
sum = sum.add(BigInteger.valueOf((long) (bookHeight[i])));
temp = sum.max(b);
iCount++;
if (temp.equals(sum)) break;
}
System.out.print(iCount);
}