Non-contributory periods counted as one-third of total proven contributory periods in Poland and abroad under international treaty.

The Supreme Court reversed the lower court's decision, ordering the Social Insurance Office to pay the applicant 100 PLN for procedural costs. The applicant argued that non-contributory periods should be calculated against the sum of contributory periods earned both in Poland and Bulgaria, citing the bilateral social security agreement. The court agreed, ruling that once foreign periods are recognized as contributory under the treaty, non-contributory periods must be limited to one-third of the combined total rather than just Polish periods.