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<script type="text/javascript">
window.onload = function(){
var count = 0;
document.getElementById("check").onclick = function(){
document.getElementById("input").value = (this.checked) ? count+=150 : count-=150;
};
};
</script>
<input type="checkbox" id="check" value="" />
<input type="checkbox" id="check" value="" />
<input type="checkbox" id="check" value="" />
<input type="text" id="input" value="0" />
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