SP21193 ADJDUCKS - Adjusting Ducks

Wojtek's ducks' constant quacking annoys Tomek a great deal. When approached about the issue, Wojtek told Tomek to take it easy... Things got serious when Tomek bought a sling. They held a diplomatic meeting to reach a compromise. It turns out that when two or more ducks have the same quacking pitch, the sound becomes so constant, that they do not disturb Tomek at all. Fortunately enough, the local veterinarian can alter the pitches of ducks. For changing a duck's quacking pitch fromatob, he demands |b - a| zlotys. How many zlotys does Wojtek have to spend to make it so no duck is alone at its pitch?

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