#include <cstdio>

int main() {
    int a, b, c, d;
    scanf("%d %d %d %d", &a, &b, &c, &d);
    
    if (d >= 10) return puts("Impossible"), 0;
    
    int res = 0;
    int combo = 0;
    int x = 0;
    for (int i = 0; i < b; ++i) {
        ++combo;
        if (combo % 100 == 1) ++x;
        res += 50*x;
    }
    for (int i = 0; i < a; ++i) {
        ++combo;
        if (combo % 100 == 1) ++x;
        res += 100*x;
    }
    printf("%d\n", res);
}