#include<iostream>
#include<algorithm>
using namespace std;
int a,b,c;
main()
{
	cin>>a>>b>>c;
	int ans=1e9;
	for(int i=0;i<=a;i++)
	{
		for(int j=0;j<=b;j++)
		{
			if(i+j==0)continue;
			int now=i+j*10;
			int rest=a-i+b-j;
			for(int k=0;k<now;k++)
			{
				int come=rest+k/10+k%10;
				if(come==c)ans=min(ans,now-k);
			}
		}
	}
	if(ans<1e9)cout<<ans<<endl;
	else cout<<"Impossible"<<endl;
}