import java.util.*;enum M{M;System z;float r,t;{for(Scanner s=new Scanner(z.in);z==z;z.out.printf("%.3f\n",t+273.15))for(r=s.nextFloat()-100;t!=(t+=r-((4183e-13*(t>0?0:100-t)*t-5775e-8)*t+.39083)*t););}}