<html>
<script>
function numberSum(N) {
var total = 0;
for(var i = 1; i <= N; i++){
total += i;
}
return total;
}
function run(){
val = document.getElementById("val").value;
document.getElementById("results").innerHTML="Sum is "+numberSum(val)
}
</script>
<body>
Enter Value<input id="val">
<input type="Submit" onclick="run();">
<p id="results"></p>
</body>
</html>
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