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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>
Брой на ушите на зайците
</title>
</head>
<body>
<script>
function countEars(n, sumEars, isEven)
{
if (n==0)
{
document.write(sumEars);
}
else
{
if (isEven==0)
{
sumEars+=3;
isEven=1;
}
else
{
sumEars+=4;
isEven=0;
}
countEars(n-1, sumEars, isEven);
}
}
countEars(prompt("Въведете броя на зайците:"), 0, 0);
</script>
</body>
</html>