N,K,X = map(int, input().split())
A = list(map(int, input().split())) 
DP = [[0]*2 for _ in range(N+1)]
DP[0][1] = X
for i in range(N):
    DP[i+1][0] = min(DP[i])+A[i]
    DP[i+1][1] = min(DP[i][0]+X,DP[i][1])+K
print(min(DP[-1]))