from time import clock
import sys

def FindMax(From,To):
          global Anum
          global Compare
          
          if ( From == To ):
               
               return Anum[From]
          
          if ( From+1 == To ):
               
               if int(Anum[From]) >= int(Anum[To]):
                    Compare+=1
                    return Anum[From]
               else:
                    Compare+=1
                    return Anum[To]
          
          Mid=(From+To)/2
          Max1=int(FindMax(From,Mid))
          Max2=int(FindMax(Mid +1 ,To))

          if (Max1 >= Max2):
               Compare+=1
               return Max1
          else:
               Compare+=1
               return Max2
def Main():
          InFile=open('in7_1.txt','r')
          OutFile=open('out_1_7_1.txt','w') 
          global Anum
          global Compare
          global memUsed
          memUsed=0
          start=clock()             
          
          Compare=0        
          Anum=InFile.readline().split(",")
          
          Limit=int(Anum[0])
          
          if(Limit!=len(Anum[1:])):
                print "Data is not Correct !!!"
                return     
          del Anum[0]
          OutFile.write(str(FindMax(0,Limit-1))+"\n")            

          OutFile.write("Total Excution Time is : "+str(clock()-start)+"\n")  
          OutFile.write("Total Comparision is : "+str(Compare)+"\n")  
          
          memUsed+=sys.getsizeof(InFile)+sys.getsizeof(OutFile)+sys.getsizeof(Anum)+sys.getsizeof(Compare)+sys.getsizeof(Limit)+sys.getsizeof(start)
          OutFile.write("Memory Used : "+str(memUsed)+" Bytes\n")  

          InFile.close()
          OutFile.close()
          
          print "Check Your Output File : out_1_sec7_1.txt is Generated"
          InFile.close()
          OutFile.close()




Main()