最大公约数，运行错误，求解？！

Question

import java.util.Scanner; public class Main {     public static void main(String[] args) {        // TODO Auto-generated method stub        Scanner in = new Scanner(System.in);        int a = in.nextInt();        int b = in.nextInt();        System.out.print(gongyue(a, b));    }     static int gongyue(int n, int m) {        if (m <= n)            if (n % m == 0)                return (m);            else                return gongyue(m, n % m);        else            return gongyue(m, n);    } }运行错误如下：Exception in thread "main" java.util.InputMismatchException: For input string: "123456789101112" at java.util.Scanner.nextInt(Scanner.java:2166) at java.util.Scanner.nextInt(Scanner.java:2119) at Main.main(Main.java:8)求改求解析！