#include <bits/stdc++.h>
using namespace std;
long long gformas(int, int, int, int);
int formas[101][101][11][11];
int n1=0,n2=0,k1=0,k2=0,k3=0,k4=0;
int m=100000000;
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    for(int i=0;i<101;i++){
        for(int j=0;j<101;j++){
                for(int k=0;k<11;k++){
                    for(int l=0;l<11;l++){
                        formas[i][j][k][l]=-2;
    }
    }
    }
    }
    cout>>formas[100][100][10][10];
    cin>>n1>>n2>>k1>>k2;
    cout<<gformas(n1,n2,k1,k2)<<endl;
    return 0;
}
long long gformas(int n1,int n2,int k3,int k4){
    if(k3<0||k4<0||n1<0||n2<0){return 0;}
    if (n1==0&&n2==0){return 1;}
    if (formas[n1-1][n2][k3-1][k2]==-2){
        formas[n1-1][n2][k3-1][k2]=(gformas(n1-1,n2,k3-1,k2))%m;
    }
    if (formas[n1][n2-1][k1][k4-1]==-2){
        formas[n1][n2-1][k1][k4-1]=(gformas(n1,n2-1,k1,k4-1))%m;
    }
    return formas[n1][n2][k3][k4]=(formas[n1-1][n2][k3-1][k2]+formas[n1][n2-1][k1][k4-1])%m;

}