Instructions: In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Input: Passage: Raffaello de Banfield attended the Swiss International "Lyceum Alpinum Zuoz", the "Dante Alighieri" Lyceum in Trieste, the University of Bologna and the Benedetto Marcello Conservatory in Venice led by Gian Francesco Malipiero. He studied composition from 1946 to 1949 at the National Conservatory (under the direction of Henri Busser) with Nadia Boulanger in Paris. In these years he met Herbert von Karajan with whom he had a lifelong friendship, and also with artists such as Pablo Picasso, Jean Cocteau and Francis Poulenc. In the United States he belonged to the intellectual circle surrounding the writer and composer Paul Bowles, through which he met Tennessee Williams and Leonard Bernstein. In 1949 through the painter Leonor Fini he was introduced to the choreographer and ballet dancer Roland Petit; out of this grew the ballet Le combat ("The Duel"), which had its first original production in London in 1949. This piece, based upon the Tancred and Clorinda episode in Torquato Tasso's poem Gerusalemme liberata, was performed 39 times at the Vienna State Opera in the choreography of Dimitrije Parlic between 1959 and 1973. Until 1958 he spent time between Paris and New York and maintained a friendship also with Maria Callas. After years abroad in Italy, France, England and the United States, where he lived for more than ten years, he was from 1972 to 1996 Director of the Giuseppe Verdi Theatre in Trieste and he comprehensively renovated and modernised the Opera House. From 1978 to 1986 he was Director of the "" ("Festival of the two worlds") in Spoleto, Italy.
 Link Information: Leonor Fini (August 30, 1907 – January 18, 1996) Question: What were the combined ages of Leonor Fini and Roland Petit the year that the ballet Le combat ("The Duel"), which had its first original production in London?
Output:
Answer: 67