/in/Main.java:12: error: no suitable constructor found for BigInteger(BigInteger)
        BigInteger c=new BigInteger(a.gcd(b));
                     ^
    constructor BigInteger.BigInteger(byte[]) is not applicable
      (argument mismatch; BigInteger cannot be converted to byte[])
    constructor BigInteger.BigInteger(int[]) is not applicable
      (argument mismatch; BigInteger cannot be converted to int[])
    constructor BigInteger.BigInteger(String) is not applicable
      (argument mismatch; BigInteger cannot be converted to String)
    constructor BigInteger.BigInteger(long) is not applicable
      (argument mismatch; BigInteger cannot be converted to long)
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error