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#include <stdio.h>
int main()
{
FILE *f = fopen("INP.TXT", "r");
unsigned long long x, y, k, i;
fscanf(f, "%lld %lld %lld", &x, &y, &k);
fclose(f);
i = y / (x * 6 + k) * 6;
while (i * x + (i + 5) / 6 * k < y)
i++;
f = fopen("OUT.TXT", "w");
fprintf(f, "%lld\n", i);
fclose(f);
return 0;
}
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