Task: Question Answering
Input (English): Passage: In 326 BCE, Alexander the Great invaded Pauravas and defeated King Porus. His armies entered the region via the Hindu Kush in northwest Pakistan and his rule extended up to the city of Sagala . In 305 BCE the area was ruled by the Maurya Empire. In a long line of succeeding rulers of the area, Chandragupta Maurya and Ashoka stand out as the most renowned. The Maurya presence in the area was then consolidated in the Indo-Greek Kingdom in 180 BCE. Menander I Soter "The Saviour"  is the most renowned leader of the era, he conquered the Punjab and made Sagala the capital of his Empire. Menander carved out a Greek kingdom in the Punjab and ruled the region till his death in 130 BCE. The neighbouring Seleucid Empire rule came to an end around 12 BCE, after several invasions by the Yuezhi and the Scythian people. In 711-713 CE, the 18-year-old Arab general Muhammad bin Qasim of Taif, a city in what is now Saudi Arabia, came by way of the Arabian Sea with Arab troops to defeat Raja Dahir. Bin Qasim then led his troops to conquer the Sindh and Punjab regions for the Islamic Umayyad Caliphate, making him the first to bring Islam to the region. 
Question: How many years after Alexander the great defeated King Porus during his invasion of Pauravas did the Indo-Greek Kingdom form? 
Answer type: Number 
Output (English): 146.