C :

#include<stdio.h>

int main()
{
	int tmp=1,max=0;
	while(scanf("%d",&tmp)!=EOF)
	{
		
		if(tmp>max)
		{
			max=tmp;		
		}
		if(tmp==0)
		{
			printf("%d\n",max);
			max=0; 
		}
	}
	return 0;
}

C++ :

#include<stdio.h>
int max(int a,int b)
{
	return a>b?a:b;
}
int main()
{
	int maxnum=0,temp;
	while(scanf("%d",&temp)!=EOF)
	{
		maxnum=temp;
		while(scanf("%d",&temp)!=EOF&&temp)
		{
			maxnum=max(maxnum,temp);
		}
		printf("%d\n",maxnum);
	}
	return 0;
}

Pascal :

var a,b,c,d,e:integer;
begin
 while not eof do
 begin
   e:=-999;
    a:=1;
while a<>0 do
begin
  read(a);
  if a>e then e:=a;
end;
writeln(e);
end;
end.