import java.util.*;
public class Main { public static void main(String[] args) { Scanner console = new Scanner(System.in); int m = console.nextInt(); int n = console.nextInt(); //计算最小公倍数 int result = getCM(m, n); System.out.println(result); }
public static int getCM(int m, int n){
//write your code here......
int max=Math.max(m,n);
for(int i=max;i<=m*n;i++){
if(i%m==0&i%n==0){
return i;
}
}
return -1;
}
}

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