public static void main(String args[]) throws Exception {
Scanner cin = new Scanner(System.in);
BigInteger s, M;
int p, i;
while (cin.hasNext()) {
p = cin.nextInt();
s = BigInteger.valueOf(4);
M = BigInteger.ONE;
M = M.shiftLeft(p).subtract(BigInteger.ONE);
for (i = 0; i < p - 2; ++i) {
s = s.multiply(s).subtract(BigInteger.valueOf(2));
while (s.bitLength() > p) {
s = s.shiftRight(p).add(s.and(M));
}
}
if (s.compareTo(BigInteger.ZERO) == 0 || s.compareTo(M) == 0) {
System.out.println(0);
continue;
}
String ans = "";
while (s.compareTo(BigInteger.ZERO) > 0) {
long buf = s.mod(BigInteger.valueOf(16)).longValue();
ans += Integer.toHexString((int) buf);
s = s.divide(BigInteger.valueOf(16));
}
for (i = ans.length() - 1; i >= 0; --i) System.out.print(ans.charAt(i));
System.out.println();
}
}
private void decryptTabelEntry(BigInteger[] cLabels) {
int col = 0;
for (int i = 0; i < nCIBits; i++) if (cLabels[i].testBit(0)) col |= (1 << i);
BigInteger target = EGTable[col];
BigInteger colKey = BigInteger.ZERO;
for (int k = nCIBits - 1; k >= 0; k--)
colKey = colKey.shiftLeft(Wire.labelBitLength).xor(cLabels[k]);
BigInteger res = Cipher.decrypt(colKey, target, nBits * Wire.labelBitLength);
BigInteger mask = BigInteger.ONE.shiftLeft(Wire.labelBitLength).subtract(BigInteger.ONE);
for (int k = nBits - 1; k >= 0; k--)
outputLabels[k] = res.shiftRight(Wire.labelBitLength * k).and(mask);
}
