Despite some protests, on 18 September 1773, the Committee formally signed the treaty of cession, renouncing all claims of the Commonwealth to the occupied territories. The Sejm on 30 September 1773 accepted the partition treaty. By the first partition the Polish–Lithuanian Commonwealth lost about 211,000 km² (30% of its territory, amounting at that time to about 733,000 km²), with a population of over four to five million people (about a third of its population of 14 million before the partitions). The treaty was a major success for Frederick II of Prussia: Prussia's share might have been the smallest, but it was also significantly developed and strategically important. Russia received the largest, but economically least-important area, in the northeast.