UVa 11150

#include<stdio.h>
int main()
{
    int t,k;
    while(scanf("%d",&t)!=EOF){
        int c,b,i,j;
        int total=t;
        c=t%3;
        if(c==0){
            while(t>=3){
                j=t/3;
                total=total+j;
                i=t%3;
                t=j+i;
            }
            if(t==2)
                total++;
        }
        else{
            if(c==1){
                b=(t+2)/3;
                if(b%2==0)
                    t=t+2;
            }
            else if(c==2)
                t=t+1;
            while(t>=3){
                j=t/3;
                total=total+j;
                i=t%3;
                t=j+i;
            }
       }
        printf("%d\n",total);
    }
    return 0;
}