#include<iostream> using namespace std; int main(){ int a[11]={0},b=1,c=0; while(b<=1000){ if(b+c<=10){ a[c+b]++; c=c+b; } else{ a[c]=a[c]+1; c=(c+b)%10; } b++; } b=1; while(b<=10){ if(a[b]==0){ cout<<b<<endl; } b++; } return 0; }