import sys
from sys import stdin

N,K,X = map(int,stdin.readline().split())

A = list(map(int,stdin.readline().split()))

inf = float("inf")
dp = [[inf,inf] for i in range(N+1)]
dp[0] = [0,inf]

for i in range(N):

    dp[i+1][0] = min(dp[i]) + A[i]

    dp[i+1][1] = min( dp[i][0]+K+X , dp[i][1]+K )

print (min(dp[-1]))