#include<stdio.h>
int main (){
   int nletti = 0, massimo;
   scanf("%d",&nletti);
   if(nletti < 0)
       printf("-5");
   else{ 
    massimo = nletti;
    while(nletti >= 0) { 
     scanf("%d", & nletti);
     if(massimo <= nletti)
         massimo=nletti;
                           }
      printf("%d",massimo);
                     }
    return 0;
    }

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