#include <stdio.h>

int a;
int b;
int e;
int r;
char c;

	int main(){
		printf("vvedite 1 chislo\n");
			scanf("%d", &a);
		printf("vvedite operachiyu\n");
			scanf("%s", &c);
		printf("vvedite 2 chislo\n");
			scanf("%d", &b);


		if (c =='+')
			r = 1;
		else if (c =='-')
			r = 2;
		else if (c =='*')
			r = 3;
		else if (c =='/')
			r = 4;

switch (r){
	case 1 : summa(); break;
	case 2 : raznost(); break;
	case 3 : umnogenie(); break;
	case 4 : delenie(); break;
}
}
void summa(){
	e = a+b;
	printf("otvet %d", e);
}
void raznost(){
	e = a-b;
	printf("otvet %d", e);
}
void umnogenie(){
	e = a*b;
	printf("otvet %d", e);
}
void delenie(){
	e = a/b;
	printf("otvet %d", e);
}