View Compilation Error

0_0_6220609_17831\Main.java:12: incompatible types
found   : int
required: java.math.BigInteger
            a = cin.nextInt();
                           ^
0_0_6220609_17831\Main.java:13: incompatible types
found   : int
required: java.math.BigInteger
            b = cin.nextInt();
                           ^
2 errors