diff --git a/abc042/a.c b/abc042/a.c
new file mode 100644
index 0000000..9e01ce2
--- /dev/null
+++ b/abc042/a.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#define ARRAY_SIZE	3
+
+int	compare_number(const void *number1, const void *number2);	
+
+int	main(void)
+{
+	int	i;
+	int	input_array[ARRAY_SIZE];
+
+	i = 0;
+	while (i < ARRAY_SIZE)
+	{
+		scanf("%d", &input_array[i]);
+		++i;
+	}
+	qsort(input_array, ARRAY_SIZE, sizeof(int), compare_number);
+	if (input_array[0] == 5 && input_array[1] == 5 && input_array[2] == 7)
+	{
+		puts("YES");
+	}
+	else
+	{
+		puts("NO");
+	}
+}
+
+int	compare_number(const void *number1, const void *number2)
+{
+	if (*(int *)number1 > *(int *)number2)
+	{
+		return (1);
+	}
+	else if (*(int *)number1 < *(int *)number2)
+	{
+		return (-1);
+	}
+	else
+	{
+		return (0);
+	}
+}