#include
using namespace std;
int main()
{
long long int a, b, c;
char ch;
cin >> ch;
while (0 <= a, b, c <= 10e8)
{
if (ch ==‘x’ || ch == ‘X’)
{
break;
}
if (ch != 'x' || ch != 'X')
{
if (ch == '+')
{
cin >> a >> b;
c = a + b;
cout << c << endl;
}
else if (ch == '-')
{
cin >> a >> b;
c = a - b;
cout << c << endl;
}
else if (ch == '*')
{
cin >> a >> b;
c = a * b;
cout << c << endl;
}
else if (ch == '/')
{
cin >> a >> b;
c = a / b;
cout << c << endl;
}
else if (ch == '%')
{
cin >> a >> b;
c = a % b;
cout << c << endl;
}
else
{
cout << "Invalid operation. Try again."<<endl;
cin>>ch;
}
}
}
return 0;
}