diff --git a/syamauchi/src/C081.java b/syamauchi/src/C081.java
new file mode 100644
index 0000000000000000000000000000000000000000..35882512313bd92f38b1b626a62ae15a2b0d9bd8
--- /dev/null
+++ b/syamauchi/src/C081.java
@@ -0,0 +1,92 @@
+package src;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+
+public class C081 {
+  private final int amount;
+
+  private C081(final int amount) {
+    this.amount = amount;
+  }
+
+  public static void main(String[] args) {
+    final Scanner sc = new Scanner(System.in);
+    new C081(sc.nextInt()).countOfPair(sc);
+    sc.close();
+  }
+
+  private void countOfPair(final Scanner sc) {
+    int pair = 0;
+    // 各種類の靴下の数を集計
+    final Map<String, Integer> socksMap = countOfSocks(sc);
+    // SocksMapからペアになる靴下を探す
+    for (Map.Entry<String, Integer> firstSock : socksMap.entrySet()) {
+      for (Map.Entry<String, Integer> secondSock : socksMap.entrySet()) {
+        if (isPair(firstSock.getKey(), secondSock.getKey())) {
+          // ペアが見つかった時
+          pair = pair + addPair(socksMap, firstSock.getKey(), secondSock.getKey());
+
+        }
+      }
+
+    }
+
+    System.out.println(pair);
+  }
+
+  private Map<String, Integer> countOfSocks(final Scanner sc) {
+    final Map<String, Integer> socksMap = new HashMap<>();
+    for (int i = 0; i < this.amount; i++) {
+      final String kind = sc.next();
+      final String direction = sc.next();
+      final String sock = kind + direction;
+      addSocks(socksMap, sock);
+    }
+
+    return socksMap;
+  }
+
+  private void addSocks(final Map<String, Integer> socksMap, final String sock) {
+    final int addValue = 1;
+    if (socksMap.containsKey(sock)) {
+      socksMap.put(sock, socksMap.get(sock) + addValue);
+    } else {
+      socksMap.put(sock, addValue);
+    }
+  }
+
+  private int addPair(final Map<String, Integer> socksMap, final String firstSock,
+      final String secondSock) {
+    final int decValue = 1;
+    int pair = 0;
+    while (isPairRemain(socksMap.get(firstSock), socksMap.get(secondSock))) {
+      pair = pair + 1;
+      socksMap.put(firstSock, socksMap.get(firstSock) - decValue);
+      socksMap.put(secondSock, socksMap.get(secondSock) - decValue);
+    }
+    return pair;
+  }
+
+  private boolean isR(final String sock) {
+
+    return (sock.charAt(1) == 'R');
+  }
+
+  private boolean isL(final String sock) {
+    return (sock.charAt(1) == 'L');
+  }
+
+  private boolean isPair(final String l, final String r) {
+    return (isL(l) && isR(r) && isSameSock(l, r));
+  }
+
+  private boolean isPairRemain(final int l, final int r) {
+    return (l > 0 && r > 0);
+  }
+
+  private boolean isSameSock(final String a, final String b) {
+    return a.charAt(0) == b.charAt(0);
+  }
+}