function Main(input) {
    var inputArr = input.split('\n');
    var str = inputArr[0];
    var oArr = str.match(/[\*\+]/g);
    var nArr = str.match(/[0-9]+/g);

    var tmp = +nArr[0];

    var i;
    var len = oArr.length;
    for(i = 0; i < len; i++) {
        if(false) {
        } else if(oArr[i] === '*') {
            tmp += +nArr[i + 1];
        } else if(oArr[i] === '+') {
            tmp *= +nArr[i + 1];
        }
    }

    var ans = tmp;

    console.log(ans);
}

// Don't edit this line!
Main(require("fs").readFileSync("/dev/stdin", "utf8"));