import std.algorithm;
import std.array;
import std.conv;
import std.math;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

void main() {
    auto ss = reads!string;
    int a = ss[0].to!int;
    int b = ss[2].to!int;

    switch (ss[1]) {
    case "+":
        writeln(a + b);
        break;
    case "-":
        writeln(a - b);
        break;
    default: break;
    }
}
