diff --git a/koki/map.js b/koki/map.js
index 7f17a7e..29583fb 100644
--- a/koki/map.js
+++ b/koki/map.js
@@ -8,7 +8,7 @@
     var gpsmarker = L.marker(mymap.getCenter()).addTo(mymap);
     gpsmarker.bindPopup("START").openPopup();
 
-    var stamp = null;
+    var stamp = 0;
     var nTrial = 10;
     var watchId = null;
     function stopGPS() {
@@ -56,9 +56,9 @@
 	var x =L.latLng([38.919212, 139.828072]);
 	console.log(latlng.distanceTo(x));
 	if (latlng.distanceTo(x) < 30) {
-	    if (stamp == null) {
+	    if (stamp == 0) {
 		alert("スタンプゲット!!");
-		stamp = get;
+		stamp += 1;
 	    }
 	    
 	}