package acm;public class FrogDate {    public static void main(String[] args) {                int x = 11,y = 21,m = 31,n = 41,l = 44;        int ar=n-m,br=0,cr=x-y;        int M = exGcd(n-m,l,ar,br);        System.out.println("M:" + M);                if((x-y)%M!=0 || m==n)             System.out.println("Impossible");        else{              int s=l/M;              ar=ar*((x-y)/M);              ar=(ar%s+s)%s;              System.out.println("ar : " + ar);        }    }        static int Gcd(int a, int b)      {          while(b != 0)          {              int r = b;              b = a % b;              a = r;          }          return a;      }        static int exGcd(int a, int b, int x, int y)      {        if(b == 0)          {              x = 1;              y = 0;              return a;          }          int r = exGcd(b, a % b, x, y);          int t = x;          x = y;          y = t - a / b * y;          return r;      }     }