import
    std.stdio,
    std.conv,
    std.string,
    std.regex,
    std.algorithm,
    std.array;

void main(){
    string text = readln.strip;
    string[] numStr = text.split(regex("[\\+-]"));
    int[] num = numStr.map!(to!int).array;
    if(text.indexOf("+") != -1)
        writeln(num[0] - num[1]);
    else
        writeln(num[0] + num[1]);
}