#include<stdio.h>
#include<stdlib.h>
struct ListNode {
int val;
struct ListNode* next;
};
int main() {
int n;
scanf_s("%d", &n);
struct ListNode* head = NULL, * head2 = head;
for(int i = 0 ;i < n; i++){
struct ListNode* t = (struct ListNode*)malloc(sizeof(struct ListNode));
t->val = i + 1;
t->next = NULL;
if (!head) {
head = t;
head2 = head;
}
else {
head->next = t;
head = head->next;
}
}
head->next = head2;
while (head2->next != head2) {
struct ListNode* t = head2->next;
head2 = head2->next->next;
t->next = head2->next;
free(head2);
head2 = t->next;
}
if (head != NULL) {
printf("%d", head2->val);
}
else {
printf("出错了!");
}
return 0;
}
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