function Main(input) {
    var inp = input.split("\n");
    inp = inp.map(x => parseInt(x));
    var sum = 0;
    var i = 0;
    while (i < inp.length-1) {
        sum = sum + inp[i];
        i++;
    }
    console.log(sum);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));