ACM 11150 - Cola

#include <stdio.h>

int main()
{
    int n;
    while (scanf("%d", &n) == 1)
    {
        int total = n, recode;
        for (;n > 2;)
        {
            total += n / 3;
            recode = n / 3;
            n = (n % 3 + recode);
        }
        if (n == 2) total ++;
        printf("%d\n", total);
    }
    return 0;
}

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