#include <iostream>
#include <cmath>
#include <algorithm>

using namespace std;

int main() {
    int Y1, Y2, T1, T2, T;
    cin >> Y1 >> Y2 >> T1 >> T2 >> T;
    
    // 计算赋分
    double Y = Y1 + (double)(Y2 - Y1) * (T - T1) / (T2 - T1);
    
    // 四舍五入
    int result = round(Y);
    
    // 确保结果在Y1和Y2之间（虽然题目保证输入合法）
    result = max(Y1, min(Y2, result));
    
    cout << result << endl;
    
    return 0;
}