TensorFlow basic program

import tensorflow as tf

graph = tf.Graph()

with graph.as_default():
    a = tf.Variable(500)
    b = tf.constant(50)
    c = tf.Variable(0)
    Y = tf.assign(c,a+b)
    init = tf.global_variables_initializer()

with tf.Session(graph=graph) as sess:
    init.run()
    print(Y.eval())