'''
Created on Sep 23, 2017

@author: Susan
'''

def computeCups(calplan, eaten, calperserv, servsize):
    calleft = calplan - eaten
    if calleft <=0:
        return 0
    numServ = calleft/(calperserv*1.0)
    answer = int(numServ * servsize)
    return answer



if __name__ == '__main__':
    calplan = 2000
    eaten = 1600
    calperserv = 110
    servsize = 0.75
    ans = computeCups(calplan, eaten, calperserv, servsize)
    print calplan, eaten, calperserv, servsize, ans