#include
int main() {
int nums = 0, ret = 0;
while (scanf("%d", &nums) != EOF) {
if (nums == 0) {
return 0;
}
else {
while (nums >= 3) {
ret+=(nums/3);
nums = (nums / 3) + (nums % 3);
}
if ( nums == 2) {
printf("%d\n",ret+1);
}
else {
printf("%d\n", ret);
}
}
ret = 0;
}
return 0;
}
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