diff --git a/04.c b/04.c
new file mode 100644
index 0000000..377df87
--- /dev/null
+++ b/04.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h> 
+
+int main () {
+	int sum = 0;
+	unsigned int p1,p2,r1,r2 = 0;
+
+	while (scanf("%u-%u,%u-%u\n", &p1,&p2,&r1,&r2) != EOF) {
+		if (((p1 <= r1) && (p2 >= r2)) || ((p1 >= r1) && (p2 <= r2)))
+			sum +=1;
+	}
+	printf("%d\n", sum);
+
+}
diff --git a/04_02.c b/04_02.c
new file mode 100644
index 0000000..9facebd
--- /dev/null
+++ b/04_02.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h> 
+
+int main () {
+	int sum = 0;
+	unsigned int p1,p2,r1,r2 = 0;
+
+	while (scanf("%u-%u,%u-%u\n", &p1,&p2,&r1,&r2) != EOF) {
+		if (((p1 <= r1) && (r1 <= p2)) || ((p1 <= r2) && (r2 <= p2)) || (r1 <= p1) && (p1 <= r2) || (r1 <= p2) && (p2 <= r2))
+			sum +=1;
+	}
+	printf("%d\n", sum);
+
+}