diff --git a/zeta_C/completed/2828.c b/zeta_C/completed/2828.c
new file mode 100644
index 0000000..896700a
--- /dev/null
+++ b/zeta_C/completed/2828.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    int N, M, J, cnt = 0, tmp, now = 1, flag;
+    scanf("%d %d", &N, &M);
+    scanf("%d", &J);
+    int *pos = (int *) calloc(J, sizeof(int));
+    for (int i = 0; i < J; i++) {
+        scanf("%d", pos + i);
+    }
+    for (int i = 0; i < J; i++) {
+        flag = 1;
+        while (flag) {
+            if (now <= pos[i] && pos[i] <= now + M - 1) {
+                flag = 0;
+            } else if (now > pos[i]) {
+                now--;
+                cnt++;
+            } else {
+                now++;
+                cnt++;
+            }
+        }
+    }
+    printf("%d\n", cnt);
+}
\ No newline at end of file