int main()
{
    int N,K;
    double sum=200.0;
    scanf("%d %d",&N,&K);
    int year=0,num=0;
    while(num<sum)
    {
        year++;
        num=num+N;
        sum=sum+(K/100.0)*sum;
        if(year>20)
        {
            break;
        }
    }
    if(year<=20)
    {
        printf("%d",year);
    }
    else
    {
        printf("Impossible");
    }
    return 0;
}