[Greek Prime Minister Tsipras gestures during the session 'The Future of Europe' at the annual meeting of the World Economic Forum (WEF) in Davos]Greek Prime Minister Alexis Tsipras said on Wednesday he was ready to talk to protesting farmers over pension reform, but said the broader system still needed to be overhauled to safeguard its viability. "We are already doing that with self-employed ... we are aspiring to do the same with farmers, provided they want to sit down to dialogue to find a solution," Tsipras said. Thousands of farmers have been blockading motorways across the country for three weeks over reforms, which call on them to pay higher social security contributions and taxes.