diff --git "a/P1209 \345\255\252\347\224\237\347\264\240\346\225\260.c" "b/P1209 \345\255\252\347\224\237\347\264\240\346\225\260.c"
index 9959cad..4fca76e 100755
--- "a/P1209 \345\255\252\347\224\237\347\264\240\346\225\260.c"	
+++ "b/P1209 \345\255\252\347\224\237\347\264\240\346\225\260.c"	
@@ -9,7 +9,7 @@ int main()
 	while (scanf("%d", &m) != EOF)
 	{
 		int i;
-		for (i = m; i > 0; i--)
+		for (i = m-2; i > 0; i--)//不得超过m
 		{
 			if (prime_number(i) == 1 && prime_number(i + 2) == 1)
 			{
@@ -31,4 +31,4 @@ int prime_number(int n)
 			t = 0;
 	}
 	return t;
-}
\ No newline at end of file
+}