#include <stdio.h>

//阶乘
long long Factorial(int n)
{
	long long i = 1,sum = 1;
	for(i = 1; i <= n; i++)
		sum *= i;
	return sum;
}

int main()
{
	int a,b;
	char c;
	while(scanf("%d %c",&a,&c) != EOF)
	{
		if(c != '!') scanf(" %d",&b);
		if(c == '!')
			printf("%lld\n",Factorial(a));
		else 
		{
			switch(c)
			{
				case '+':printf("%d\n",a+b);break;
				case '-':printf("%d\n",a-b);break;
				case '*':printf("%d\n",a*b);break;
				case '%': if(b == 0) printf("error\n");
						else printf("%d\n",a%b);break;
				case '/': if(b == 0) printf("error\n");
						else printf("%d\n",a/b);break;	
			}
		}
	}
	
	return 0;
}