import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		new Main().run();
	}
	
	int[] f(int cost,int a,int b) {
		int over=a+10*b-cost;
		return new int[] {over%10,over/10};
	}
	
	void run() {
		Scanner sc=new Scanner(System.in);
		int A=sc.nextInt();
		int B=sc.nextInt();
		int C=sc.nextInt();
		long[][] dp=new long[A+1+10*B][B+1+A/10];
		for(int i=0;i<dp.length;++i)for(int j=0;j<dp[i].length;++j)dp[i][j]=Long.MAX_VALUE/3;
		dp[A][B]=0;
		for(int res=A+10*B;res>0;--res) {
			for(int b=0;10*b<=res;++b) {
				int a=res-10*b;
				if(a>=dp.length||dp[a][b]==Long.MAX_VALUE/3)continue;
				for(int cost=1;cost<=res;++cost) {
					for(int use_a=0;use_a<=a;++use_a) {
						for(int use_b=0;use_b<=b;++use_b) {
							if(use_a+use_b*10<cost)continue;
							int[] x=f(cost,use_a,use_b);
							dp[a-use_a+x[0]][b-use_b+x[1]]=Math.min(dp[a-use_a+x[0]][b-use_b+x[1]], dp[a][b]+cost);
						}
					}
				}
			}
		}
		long ans=Long.MAX_VALUE/3;
		for(int a=0;a<=A&&C-a>=0;++a) {
			int b=C-a;
			if(b>=dp[a].length||(a==A&&b==B))continue;
			ans=Math.min(ans, dp[a][b]);
		}
		System.out.println(ans==Long.MAX_VALUE/3?"Impossible":ans);
	}
	
	void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
}


class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}