// yukicoder: No.222 引き算と足し算
// 2019.4.14 bal4u

#include <stdio.h>

char s[20], *p = s;

int in()   // 整数の入力（負数に対応）
{
	int n = 0, c = *p++;
	if (c == '-') {
		c = *p++;
		do n = 10 * n + (c & 0xf), c = *p++; while (c >= '0');
		return -n;
	}
	do n = 10 * n + (c & 0xf), c = *p++; while (c >= '0');
	return n;
}

int main()
{
	int a, b, op;

	scanf("%s", s);
	a = in(), op = *(p-1), b = in();
	if (op == '+') a -= b; else a += b;
	printf("%d\n", a);
	return 0;
}