KHRUSHCHEV IN THE USA: Des Moines, Iowa, 22 – Soviet Prime Minister Nikita Khrushchev arrived today in the fourth city on his historic tour of the United States, following stopovers in New York, Los Angeles and San Francisco. The good humor and affability he displayed and the warm welcome afforded by the people of America’s Pacific Coast cities during the last hours of his stay there, were in evidence again today as he emerged from the aircraft that carried him from San Francisco. His happy mien contrasted with the cloudy sky and threat of rain. His first message upon arrival in Iowa was that, in his opinion, two or three summit meetings per year between the world’s greatest powers would greatly help to reduce the tension between East and West. STUDENT TICKET: University students yesterday gathered outside the University of Athens to hold a silent protest march demanding a 50 percent discount on public transport. As they were preparing to march toward the Transport Ministry, where they were to disperse peacefully, they were stopped by police. A number of the students resisted and there were minor scuffles.