diff --git a/src/lab/exp1/simulation/index.html b/src/lab/exp1/simulation/index.html
index d6ceab13..5187d44a 100644
--- a/src/lab/exp1/simulation/index.html
+++ b/src/lab/exp1/simulation/index.html
@@ -4,7 +4,7 @@
 <link rel="stylesheet" type="text/css" href="../../normalize.css">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <!-- Bootstrap -->
-<link rel="stylesheet" href="q	bootstrap-3.1.1-dist/css/bootstrap.min.css" media="screen">    
+<link rel="stylesheet" href="q	bootstrap-3.1.1-dist/css/bootstrap.min.css" media="screen">
 <link rel="stylesheet" type="text/css" href="../../style.css">
 <!-- <link rel="stylesheet" type="text/css" href="../../bstyle.css"> -->
 <!-- <link rel="stylesheet" type="text/css" href="../../fonts.css"> -->
@@ -48,7 +48,7 @@
 			<div id = 'NumApproCodeContent3' >&emsp;&emsp;&emsp;double sum;</div>
 			<div id = 'NumApproCodeContent4' >&emsp;&emsp;&emsp;scanf("%d%d", &a, &b );</div>
 			<div id = 'NumApproCodeContent5' >&emsp;&emsp;&emsp;sum = 0; width = 1; i = 0;</div>
-			<div id = 'NumApproCodeContent6' >&emsp;&emsp;&emsp;for ( i = a; b >= i; i += width){</div>
+			<div id = 'NumApproCodeContent6' >&emsp;&emsp;&emsp;for ( i = a; b > i; i += width){</div>
 			<div id = 'NumApproCodeContent7' >&emsp;&emsp;&emsp;&emsp;&emsp;sum = sum + cos(2*Pi/13*i) * width;</div>
 			<div id = 'NumApproCodeContent8' >&emsp;&emsp;&emsp;}</div>
 			<div id = 'NumApproCodeContent9' >&emsp;&emsp;&emsp;printf("Integration value = %d", sum);</div>
@@ -56,7 +56,7 @@
 		</div><!-- end of programCode -->
 	</div><!-- end of stepExecutionDisplay -->
 </div><!-- end of executionDivision -->
-<div class = 'outputDivision' > 
+<div class = 'outputDivision' >
 	<div class = 'outputDivisionTitle' ><div class = 'outputPic' ></div><div class = 'outputText' >Graph Visualization</div></div>
 	<div class = 'resultDisplay' id = 'resultDisplay' >
 		<div class = 'graph'>
diff --git a/src/lab/exp1/simulation/numericalApproximation.js b/src/lab/exp1/simulation/numericalApproximation.js
index 5ca76384..f2b1f3e4 100644
--- a/src/lab/exp1/simulation/numericalApproximation.js
+++ b/src/lab/exp1/simulation/numericalApproximation.js
@@ -245,7 +245,7 @@ window.view = {
 		model.incrementInWidth();
 		this.sum = Math.round(model.sum * 100) / 100;
 		this.setInnerHtml('valuesum', this.sum);
-		this.setInnerHtml('valuei', model.inputValueA);
+		this.setInnerHtml('valuei', model.inputValueA-1);
 	},
 	// calculateXCoordinates: compute starting position of xCoordinatesValue on x-axis.
 	calculateXCoordinates: function () {