1 files changed, 20 insertions, 0 deletions
diff --git a/2ndary/12/Q-VĩnhTường-2006/cau1.c b/2ndary/12/Q-VĩnhTường-2006/cau1.c
new file mode 100644
index 0000000..173e7c2
--- /dev/null
+++ b/2ndary/12/Q-VĩnhTường-2006/cau1.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+	char b[100], i;
+	short a = 0;
+
+	scanf("%s", b);
+
+	for (i = strlen(b) - 1; i >= 0; i -= 2)
+		a += b[i] - 48;
+
+	for (i = strlen(b) - 2; i >= 0; i -= 2)
+		a += b[i] * 2 - 96;
+
+	printf("%d\n", a % 3);
+
+	return 0;
+}