#include <cstdio>
int main() {
	char* str = new char[100];
	fgets(str, 100, stdin);
	int a1 = 0, a2 = 0, h1 = 1, h2 = 1;
	if (*str == '-' || *str == '+') {
		if (*str == '-') {
			h1 = -1;
		}
		++str;
	}
	while(*str >= '0' && *str <= '9'){
		a1 = 10 * a1 + (*str - '0');
		++str;
	}
	if (*str == '+') {
		h2 *= -1;
	}
	++str;
	if (*str == '-' || *str == '+') {
		if (*str == '-') {
			h2 *= -1;
		}
		++str;
	}
	while (*str >= '0' && *str <= '9') {
		a2 = 10 * a2 + (*str - '0');
		++str;
	}
	printf("%d\n", h1*a1 + h2*a2);
}