View Compilation Error

0_0_6254728_884\Main.java:20: multiply(java.math.BigInteger) in java.math.BigInteger cannot be applied to (int)
				ans = ans.multiply(i);
				         ^
0_0_6254728_884\Main.java:23: divide(java.math.BigInteger) in java.math.BigInteger cannot be applied to (int)
					ans = ans.divide(j);
					         ^
2 errors