#include <stdio.h>

int main(void){
	
	int pos=0, mul;
	int sumA, sumB;
	int symbol;
	char op, s[20];
	scanf("%s", s);
	
	symbol = 1;
	if(s[pos] == '-'){
		symbol = -1;
		pos++;
	}else if(s[pos] == '+'){
		pos++;
	}
	mul = 0;
	for( ; '0'<=s[pos] && s[pos]<='9';pos++){
		mul = mul * 10 + (int)(s[pos]-'0');
	}
	sumA = symbol * mul;
	
	op = s[pos];
	pos++;
	
	symbol = 1;
	if(s[pos] == '-'){
		symbol = -1;
		pos++;
	}else if(s[pos] == '+'){
		pos++;
	}
	mul = 0;
	for(; '0'<=s[pos] && s[pos]<='9';pos++){
		mul = mul * 10 + (int)(s[pos]-'0');
	}
	sumB = symbol * mul;
	
	if( op == '+'){
		printf("%d\n", sumA-sumB);
	}else{
		printf("%d\n", sumA+sumB);
	}
	return 0;
}