#include <bits/stdc++.h>
using longlong=long long;

[[maybe_unused]]auto cmn=[](auto&& a,auto b){if(a>b){a=b;return true;}return false;};
[[maybe_unused]]auto cmx=[](auto&& a,auto b){if(a<b){a=b;return true;}return false;};

int main(){
    std::cin.tie(nullptr);std::cin.sync_with_stdio(false);
    int a,b,c;std::cin>>a>>b>>c;
    int inf=std::numeric_limits<int>::max();
    int ans=inf;
    for(int i=0;i<=a;i++){
        for(int j=0;j<=b;j++){
            int cost=a-i+10*(b-j);
            for(int k=0;k<=cost;k++){
                if(c==i+j+k/10+k%10)cmn(ans,cost);
            }
        }
    }
    std::cout<<(ans==inf?"Impossible":std::to_string(ans))<<std::endl;
}