/** @file 373.cpp @title No.373 かけ算と割った余り - yukicoder @url https://yukicoder.me/problems/no/373 **/ #include using namespace std; typedef long long LL; #define ALL(obj) (obj).begin(), (obj).end() #define RALL(x) (x).rbegin(), (x).rend() #define SZ(x) ((int)(x).size()) #define REPI(i, a, b) for (LL i = LL(a); i < LL(b); ++i) #define REP(i, N) for (LL i = LL(0); i < LL(N); ++i) #define REPS(i, N) for (int i = 1; i <= (int)(N); i++) #define RREP(i, N) for (int i = ((int)(N)-1); i >= 0; i--) #define RREPS(i, N) for (int i = ((int)(N)); i > 0; i--) #define chmax(ret, x) ret = max(ret, x) #define chmin(ret, x) ret = min(ret, x) #define FILL(x, e) memset(x, e, sizeof(x)) #define ZEROS(x) fill(x, 0) #define SORT(x) sort(ALL(x)) #define UNIQ(x) x.erase(unique(ALL(x)), x.end()) #define BIT(n) (1LL << (n)) #define OUT(x) cout << (x) << "\n" #define DEBUG(x) cerr << #x << " : " << x << "\n" #define DEBUG2(x, y) cerr << "(" << #x << ", " << #y << ") = (" << x << ", " << y << ")\n"; #define PB push_back #define EB emplace_back #define MP make_pair #define MT make_tuple #define FI first #define SE second const int MOD = 1e9 + 7; void iostream_init() { ios::sync_with_stdio(false); cin.tie(0); cout.setf(ios::fixed); cout.precision(12); } int main() { ::iostream_init(); LL A, B, C, D; cin >> A >> B >> C >> D; A %= D; B %= D; C %= D; LL pro; pro = (A * B) % D; pro = (pro * C) % D; OUT((pro) % D); return 0; }