diff --git a/main.c b/main.c
index 4945fdc..b87907a 100644
--- a/main.c
+++ b/main.c
@@ -70,6 +70,7 @@ int main(int argc, char** argv) {
 
     float delta;
     Vector2 mouse_position;
+    char *calculation = "";
 
     while (!WindowShouldClose()) {
       delta = GetFrameTime();
@@ -79,6 +80,7 @@ int main(int argc, char** argv) {
 	for (int i = 0; i < 48; i++) {
 	  if (point_within_card(&cards[i], mouse_pos)) {
 	    cards[i].selected = !cards[i].selected;
+	    calculation = "";
 	    break;
 	  }
 	}
@@ -92,16 +94,17 @@ int main(int argc, char** argv) {
 	draw_card(&cards[i]);
       }
 
-      if (num_selected == 7) {
+      if (strlen(calculation) == 0 && num_selected == 7) {
 	Hand h;
 	h.count = 0;
 	for (int i = 0; i < 48; i++) {
 	  if (cards[i].selected) memcpy(&h.cards[h.count++], &cards[i], sizeof(Card));
 	}
 
-	char *s = TextFormat("Set: %s(%d) / Chaff: %s(%d) / Total: %d", set_teyaku_english(h), set_teyaku_points(h), chaff_teyaku_english(h), chaff_teyaku_points(h), calculate_teyaku(h));
-	DrawText(s, 10, 500, 25, BLACK);
+	calculation = TextFormat("Set: %s(%d) / Chaff: %s(%d) / Total: %d", set_teyaku_english(h), set_teyaku_points(h), chaff_teyaku_english(h), chaff_teyaku_points(h), calculate_teyaku(h));
       }
+
+      DrawText(calculation, 10, 500, 25, BLACK);
       EndDrawing();
     }