import io,os,sys
import pypyjit
pypyjit.set_param('max_unroll_recursion=-1')
sys.set_int_max_str_digits(0)
sys.setrecursionlimit(10**6)
input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline
input()
os.write(1,str(eval(input())).encode())