/*
g[n]=81n-2
*/
#include <iostream> using namespace std; int take(int money, int numOfSailor, int remaining){ if (money%numOfSailor==remaining) return (money-remaining)/numOfSailor*(numOfSailor-1); else return 0; } int main(){ int n,m,p,r; cin >> n >> m >> p >> r; for (int i=n;i<=m;i++){ int money = i; for (int j=0;j<=p;j++){ if (money) {money=take(money,p,r);} else{break;} } if (money){ cout << i; break; } } system("pause"); return 0; }
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