var h = 0;

var t = 0;

var amount = prompt('How many times?');

​

function coinFlip() {   

    var randomDecimal = Math.random();

    if (randomDecimal > 0.5) {

        return "heads";

    } else {

        return "tails";

    }   

}

​

for (var flips = 0; flips < amount; flips++) {

      if (coinFlip() === "heads") {

        h++;

      }

      else {

        t++;

      }

}

​

console.log('Times landed on heads = ' + h);

console.log('Times landed on tails = ' + t);

​