#include<stdio.h>
int main()
{
	char n[111];
	scanf("%s", n);
	int i, l = 0;
	while (n[l] != '\0')
		l++;
	if (n[0] == '-')
		printf("0\n");
	else
	{
		if (l < 2)
			printf("0\n");
		else
		{
			for (i = 0; i < l - 2; i++)
				printf("%c", n[i]);
			printf("\n");
		}
	}
	return 0;
}