#include<stdio.h>
void main(void)
{ 
	int x,max;
	printf("input numbers,last one is 0:\n");
	scanf("%d",&x);
	max=x;
	for(;x!=0;)
	{ 
		scanf("%d",&x);
		if(max < x)
			max=x;
	}
	printf("max=%d\n",max);
}