zoj 1088 System Overload

#include<stdio.h>#include<stdlib.h>#include<string.h>int main(){  int n,m,i,j,k,t,flag;     while(scanf("%d",&n),n){     flag=1;     i=1;     while(flag){       m=0;       i++;       for(j=2;j<n;j++)         m=(m+i)%j;       if(m==0)  flag=0;}     printf("%dn",i);  }  return 0;    }