#include<iostream> using namespace std; int main() { /* int n; cin>>n; switch(n){ case 1: case 3: case 5: case 7: case 8: case 10: case 12: cout<<"31"; break; case 4: case 6: case 9: case 11: cout<<"30"; break; case 2: cout<<"29"; break; default: cout<<"Invalid."; break; } */ int a,b; char op; cin>>a>>op>>b; switch(op){ case '+': cout<<a+b; case '-': cout<<a-b; case '*': cout<<a*b; case '/': cout<<a/b; } return 0; }