function Main(input) {
    input = input.split(" ");
    if(input[1] == "+"){
      var s = parseInt(input[0])+parseInt(input[2]);
    } else if(input[1] == "-"){
      var s = parseInt(input[0])-parseInt(input[2]);
    } else {
       var s = 0;
    }
    console.log('%s', s);
}

function debug(){
	var input = document.getElementById("input").value;
	Main(input);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));